The author: Dr. Donald Perkins at the weather station but, sometimes, on expedition.

Llansadwrn (Anglesey)

Diary 2017

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn

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Times are GMT (UTC, Z). Observations at this station [ ] are 24-h 09-09 GMT, some others { } occasionally refer to other 24-h periods, extremes (first indications) are given in bold and are usually 21-21 GMT. When averages are referred to (.) compares with the last decade and [.] with the new 30-y climatological average [1981 - 2010]. All data are subject to verification and amendment.

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May 2017

May 1 - began brightly with hazy sunshine after slight rain showers in the night there was moderate visibility and a light NE'ly breeze. Increasingly sunny in the afternoon when the sky cleared giving a fine sunny evening (West Freugh 20.6C Dunkerswell Aerodrome 33.2 mm St Athan 17.2 mm Kinloss 13.1h) [ Max 16.1C Min 5.5C Rain nil]. Mostly clear sky overnight and the morning of the 2nd was very fine and sunny. An overnight minimum of 5.5C and 1.6C on the grass, good visibility with light smoke haze. Pressure 1021 mb was rising with high 1034 mb over the S Norwegian Sea. A sunny afternoon (Achnagart 21.0C Tain Range -1.6C Frittenden 5.0 mm Lerwick 14.8h Aberdaron 13.9h) [Max 16.4C Min 6.5C Rain nil]. Another fine and sunny day on the 3rd with pressure steady on 1028 mb under the influence of a ridge from Norwegian Sea high 1041 mb, good visibility with moderate smoke haze. There was a cool light to moderate NE'ly breeze, although cloud increased the afternoon was mostly sunny (Achnagart 20.2C Porthmadog 19.2C Aviemore -2.4C Manston 4.4 mm Aberdaron 14.0h) [Max 15.0C Min 6.5C Rain nil]. Mostly clear sky on the 4th with some cumulus and altocumulus lenticularis developing later to disperse. There was moderate smoke haze and moderate levels of pollutant ozone in the air; the monitor at Marchlyn Mawr indicated 101 µg per m-3 . Pressure was steady on 1026 mb with high 1024 mb over the Norwegian Sea, low 998 mb mid-Atlantic to the SW, and a complex low pressure 1015 mb over the eastern Med and 1011 mb over the western Med. Sunny again with a light to moderate ENE'ly breeze by afternoon with visibility becoming clearer and very good [Max 17.3C Min 8.1C Rain nil]. After a mostly clear night the 5th began with sunshine and a cold force 4 NE'ly wind. There was a little cumulus and cirrus clouds, otherwise a nice blue sky though somewhat hazy due to pollutant smoke (04). The solarimeter was unobscured all day with a good smooth curve: total global solar radiation was 25.54 MJ m -2 highest of the month so far, with a high of 831 W m -2 recorded in the hour 12 to 13 GMT (Kinlochewe 19.9C Porthmadog 18.8C) [Max 15.9C Min 5.8C Rain nil].

On the 6th cloud had encroached and it was a dull day with cloud bases about 2500 ft on the slopes of the Carneddau Mountains. Again with a NE'ly breeze and moderate hazy visibility. The cloud had thinned by about 1800 GMT and there was a little weak sunshine, another dry day (Tyndrum 20.4C Milford Haven 17.4C Braemar -5.0C Scilly Is. 23.6 mm) [Max 12.9C M in 7.0V Rain nil]. The sky had cleared in the night and on the 7th it was a very fine sunny morning. Zero cloud as far as I could see from the weather station, very good visibility with a light NE'ly breeze developing after a calm dawn. Pressure 1023 mb was rising with low 1012 mb S Norway and low 986 mb over the Atlantic off Iberia and S of Greenland. A few very small cumuli appeared in the SW during the morning. Tiree with 15.0h had the most sunshine with Valley coming in at 14.5h and Dublin 14.8h. The highest maximum was 21.3C at Pershore [Max 15.4C Min 6.2C Rain nil]. Similar on the 8th, again no cloud at 0900 GMT, but breezier. Very good visibility with slight smoke haze. Very fine and sunny (Castlederg 19.5C Porthmadog 18.6C Tiree 15.1h Aberdaron 14.6h) [Max 13.4C Min 6.1C Rain nil]. Very fine and sunny on the 9th with a light ENE'ly breeze, good, moderate haze [Max 12.8C Min 3.9C Rain nil].

Hardly a cloud on the 10th, moderate visibility with moderate haze. Very fine and sunny, S'ly breeze later backed NE'ly, intermittently SW'ly. The soil is now very dry and there are cracks of 2 to 3 mm in undisturbed places. Soil moisture, 2 - 8 cm under grass sward, gravimetrically determined today was 41% dry mass; the top 2 cm of grass and root mass contained 67% moisture. On the met plot where there is no grass and soil is undisturbed moisture was down to 16.8% dm close to the permanent wilting percentage of the local soil which is 15.2% dm. On the vegetable plot that has been worked, but not irrigated, the moisture content at the surface was 19.8% dm. We could do with some rain! (Sheffield 19.8C Braemar -3.8C Kinlochewe 6.4 mm Wattisham 14.5h) [Max 15.2C Min 4.3C Rain nil].

A very fine and warmer morning on the 11th with few clouds. Pressure had fallen to 996 mb with a thundery low developed 990 mb near Cap Finisterre with thunderstorms breaking out in France, S England and S Wales during the day. The temperature at Gorddinog AWS rose to 21.0C and 20.3C at Gorwel Heights. Here it become cloudier in the afternoon with a maximum of 19.1C; we had slight showers in the evening and again after midnight, not enough to dampen down the dust. Tree bumblebee on Bugle flowers in the garden. We have seen tree bumblebees, new in the UK this century, in the garden the last 2 or 3 years; with the fine weather they are back and have been seen frequently on the Bugle Ajuga reptans on the rockery banks. Tree bumblebee nest on bluetit nest in nesting box. Last year they made a nest in one of the bird nest boxes. First recorded in Britain in Wiltshire in 2001, Scotland in 2013 and now Iceland and even within the Arctic Circle. Last year on emptying our nesting boxes at the end of the season we found that a blue tit nest had been taken over by tree bumblebees (right). The previous year they had nested in the eaves in an old sparrow nest! (Porthmadog 22.9C Usk No 2 17.8 mm Leeming 13.8h) [Max 19.1C Min 7.5C Rain 0.2 mm]. A dull, rather murky wet day on the 12th with poor visibility. Pressure was on 993 mb with low 990 mb over the Severn Estuary tracking slowly N to be 993 mb St George's Channel at noon and 995 mb Cardigan Bay at midnight. Rain here 1730 to 1930 GMT was moderately heavy, damped down the dust very nicely (Drumnadrochit 21.9C Gorddinog AWS and Gorwel Heights 18.6C, Scilly Is. 25.8 mm) [Max 16.0V Min 11.6C Grass 10.1C Rain 10.5 mm]. The 13th began dull and damp after the rain; there were signs of the cloud thinning and opening up with pressure 1002 mb rising. Very windy during the afternoon with strong gusts bending branches on the trees and tearing some off to litter the ground. Showers of rain came along in the evening (Weybourne 19.9C Lough Fea 18.0 mm Aberporth 7.8h) [Max 16.4C Min 9.3C 1.1 mm]. A bright and sunny day on the 14th, we still had a moderate to strong SSW'ly wind with pressure 1014 mb rising. Low 980 mb S Iceland had an occluded front moving eastward away from us giving a sunny, but breezy afternoon. Solar radiation was a high 27 .19 MJ m -2 with Valley 14.3h given the sunniest place in Britain (Heathrow 20.9C Upper Lambourn 16.6 mm Valley 14.3h) [Max 15.8C Min 9.0C Rain 1.6 mm]. With low 985 mb S of Iceland on the 15th there was an associated cloud mass over Britain and a warm front over the Irish Sea. The day began overcast with drizzle and rain, poor visibility and a moderate to strong SSW'ly wind. This situation resulted in some Föhn-enhanced AWS temperatures on the mainland in Llanfairfechan: Dwygyflchi 20.6C Gorwel Heights 20.0C; Gorddinog 19.3C; and Rhyl 19.1C demonstrating the local temperature microclimate. The MO UK maximums reported were 20.1C at Lossiemouth and Wales, Rhyl 19.1C. Capel Curig had a wet day with [65.2 mm] reported (Lossiemouth 201.1C Aboyne 1.5C Capel Curig 46.4 mm Aviemore 4.0h and Valley 0.0h) [Max 14.5C Min 10.0 Rain 17.2 mm].

The first 15-days had 30.6 mm of rainfall which was (42%) & [49%] of the monthly total averages. Temperatures had been a little lower than the monthly averages with the mean 11.4C (-0.1) & [-0.3].

The 16th began dull, wet and misty with drizzle and or rain that petered out during the morning. A mild 13.0C overnight and at 0900 GMT the temperature was 13.8C. Pressure was on 1016 mb with a large complex low pressure area 988/ 991 mb S of Iceland that covered the UK, Denmark Strait, S Norway and N Sea. High pressure was over SE Europe 1031 mb and Azores 1026 mb. In the afternoon the cloud cleared and there was sunshine (Gravesend 25.8C Hawarden 19.6C Capel Curig 38.6 mm Kirkwall 12.5h Valley 5.3h) [Max 16.4C Min 13.0C Rain 0.1 mm]. A cloudy and dull morning on the 17th with some thinner patches overhead and good visibility. Pressure was 1018 mb with the large complex low-pressure area to the NW 998 mb still dominating the scene with frontal bands traversing SE with showers following. It was not until the end of the afternoon that the cloud broke up to give some sunshine. A dry day (Langdon Bay 25.0C Braemar -1.9C Holbeach 40.4 mm Lerwick 14.1h Aberdaron 6.3h) [Max 14.3C Min 8.9C Rain nil]. The sky had cleared on the morning of the 18th giving a largely sunny morning with very good clear visibility. Pressure was on 1013 mb; the low-pressure area to the NW was filling, but still dominating the weather. Grass is growing quickly now at 8.0 g dry mass m -2 d -1 , a burst of spring growth related to flowering tiller production, and the total yield this year so far has reached 3.34 tonnes per hectare. Rain on the 15th had increasing soil moisture content to 58.6% dry mass gave a boost to growth; evaporation rates are just about balancing rainfall the PWB (potential water balance) being -0.4 mm, but the PWD (potential water deficit) indicated by lysimeter data on the 15th of the month was 23 mm. Tall native ash trees had now burst into leaf, well after the oak trees this year. The non-native horse chestnuts were in full leaf by the 4th of April. [Max 15.8C Min 8.5C Rain nil]. Pressure 1012 mb was steady on the morning of the 19th when visibility was very good and the day mostly sunny. The jetstream was fragmented with lows 1002 mb near the Western Isles and southern North Sea. (Hereford 18.2C Kinbrace -1.5C Cromer 20.4 mm Aberporth 13.9h) [Max 16.8C Min 7.3C Rain 2.3 mm]. The 20th began overcast and dull with misty cloud on the lower slopes of the Snowdonia Mountains and moderate to good visibility. Continuing unsettled pressure was on 1013 mb between low 1006 mb N Sea and low 1007 mb off the Western Isles of Scotland. It was dull, but dry and brightened up by the afternoon, Valley 3.3h sunshine (St. Helens 18.3C Bala 1.1C Fair Isle 17.6 mm Manston 13.0h) [Max 14.9C Min 7.3C Rain trace].

Meadow on Aberffraw dunes.

With 7 oktas cloud cover and a blustery S'ly breeze the 21st began fine with some sunny spells developing later. Pressure 1021 mb was rising, we were in a warm airflow from the S with high 1028 mb Germany and low 1007 mb S Portugal with a weak jetstream was aligned and there was a cloud mass lying to the north-west. Warm and sunny in SE England. (St. James Park 20.9C Braemar -0.9C Magilligan 6.4 mm Manston 13.7h) [Max 17.7C Min 10.1C Rain nil]. It was fine, dry, warmer, but cloudy on the 22nd with pressure on 1013 mb. Low 985 mb was S of Iceland and there was a frontal cloud mass lying over Ireland and the Irish Sea. The temperature at 0900 GMT was 17.5C and 62% relative humidity. There was some weak sunshine at times, several episodes of large spots of rain of little volume, and the temperature reaching 19.6C at noon St. James Park 24.9C Kielder Cs. 4.4C Tulloch Br. 16.0 mm Odiham 11.8h) [Max 19.6C Min 11.7C Grass 9.3C Rain trace]. A little brighter at 0900 GMT on the 23rd after being very murky with very poor visibility and air quality after dawn; a dusty grey deposit was evident in the routine collection. Pressure was high 1025 mb over Biscay with a warm front over S Wales and the Severn Estuary. Later fine and bright here with some sunny spells coming along, the temperature reached 20.3C being the first day having 20C, or more this year. (Hereford 23.3C Katesbridge 1.5C Kirkwall 13.8C Morecambe 12.7h Bala 10.7h) [Max 20.3C Min 11.3C Rain nil]. Continuing dull and overcast on Anglesey on the 24th, although it was warm at 0900 GMT 15.7C, with mist and fog persisting around coastal areas with no sunshine reported at Valley. Pressure 1026 mb was rising with high 1027 mb over the Severn estuary, there was a warm front over Scotland associated with low 996 mb SW Iceland. The sun did break through here later in the afternoon with the temperature rising to 21.0C; Sunny and very warm in England and S Wales (Pershore 26.6C Tredegar 24.7C Aboyne min 5.5C Loch Glascarnoch 2.8 mm Manston 14.1h St. Athan 11.3h) [Max 21.0C Min 11.3C Rain nil]. On the 25th the cloud had cleared, there was mist in the Menai Strait after dawn, but here sunny at 0900 GMT. Pressure was on 1023 mb in British high 1026 mb. Fine , sunny and warm the temperature was 20.8C in a light E'ly breeze. Overnight air minimum 9.6C the temperature went on to reach 26.5C at 1523 GMT a range of 16.9C. The rare warmth continued long into the evening (Aboyne 28.0C Rhyl 26.7C Loch Glascarnoch min 6.3C Lerwick 0.6 mm Kinloss 16.1h Aberdaron 14.8h [Max 26.5C Min 9.6C rain nil].

Almost no water in the pool. The very dry dune slack in Newborough Forest.

The dry winter and spring weather has left the south pool in Newborough Forest almost dry (left) and affected the plants growing on the adjacent remnant dune slack (right). The slack is habitat for several rare species including Welsh marsh orchid first described by R. H. Roberts, the dune helleborine and grass of Parnassus. This was in complete contrast to the record wet winter of 2015/16 that left the same pool full of water in mid July South pool full of water after wet 2015/16 winter. . The naturally regenerated pine trees that had been growing here in recent have been removed, but native birch trees now growing there in succession are contributing to the drying process of the slack putting further stress on the rare plants.

The middle slack at Aberffraw looking green.

After a winter with lower than average rainfall the vegetation on the dunes at Aberffraw was looking very dry and spring growth, especially on the fixed dunes, was slower than usual to develop. The slacks did not have their usual winter fill of rainwater, in complete contrast to the 2015/16 winter the wettest on record, and were not flooded this year. The 'big slack' in the west was very dry, but the 'middle' creeping willow and silverweed slack (above) and 'willow' slack in the east were quite green. The Burnet rose was flowering on the fixed dunes and early marsh (below left), northern marsh (below right) and pyrimidal orchids were beginning to appear in damper parts.

Early marsh orchid flowering at Aberffraw dunes. Northern marsh orchid flowering at Aberffraw dunes. The weather was similar on the 26th after a mostly clear night with an air minimum of 15.0C, third highest in May on record at the station, it was 24.7C 53% RH in a light SE'ly breeze at 0900 GMT. Pressure was steady on 1016 mb with the high 1025 mb moved over the North Sea, frontal cloud, associated with low 1001 SW Iceland lay over parts of Ireland, visible on the horizon through the day. Warm, the Föhn-enhanced temperature rising to 28.5C at 1430 GMT, highest of the month and year so far, with a low RH of 41% at 1334 GMT, and again warm into the evening. Gorddinog 28.4C Gorwel Heights 27.9C; Valley and Mona 27.3C Thunderstorms developed over N Spain during the day and moved N along western coastline of France reaching SW England and S Wales later. There were thundery outbreaks also in N Ireland, but not here (Lossiemouth 29.4C Porthmadog 28.9 C S Newington Min 6.3C Lerwick 0.4 mm Morecambe 15.5h Valley 15.3h) [Max 28.5C Min 15.0C Rain 2.5 mm].

Showery rain had moved up from the S after midnight on the 27th and there was a light shower at 0400 GMT and and a moderate shower at 0530 GMT (4.6 mm/h) 2.5 mm observed. The overnight air minimum was 16.0C, second highest in May on record at the station, and pressure 1006 mb had been falling with the thundery low 1008 mb Cardigan Bay. The sky had partially cleared, there were some lenticular altocumulus clouds to the SE of the station, before turning cloudier again later. At first very fine and again warm at 18.6C rising to the maximum 23.1C within the hour. The afternoon was cloudy and fog developed during the evening. The early morning rain contained traces of Saharan dust, a sample collected at 0900 GMT was a light reddish-brown when wet drying to a paler pinkish-white colour. Gorwel Heights 24.7C Gorddinog AWS 28.3C (Lossiemouth 27.3C Rhyl 23.8C Ravensworth Min 6.6C Levens Hall 52.6 mm Manston 11.9h) [Max 23.1C Min 16.0C Rain 4.3 mm].

From midnight on the 28th thunderstorms were being generated on a frontal arc stretching from the Bay of Biscay, the west coast of France to southern Norway. In the evening severe storms moved again along the coast from Brittany in the vicinity of the French Channel ports towards Dover and Ramsgate during the day and into the night where spectacular lightning was observed. The day here was quiet in compariso being overcast, dull, damp with little or no wind for an unusually long spell, and no lightning or thunder. Pressure 1019 mb at 0900 GMT began to fall during the afternoon (St. James Park 24.9C Usk 22.2C Okehampton Min 6.0C Aultbea 10.0 mm Shoeburyness 10.1h) [Max 16.0C Min 11.6C Rain 1.1 mm]. Weather on the 29th was very similar. Overcast and calm with low cloud on the mountain slopes and rain in sight in the west. Though mild it was a dull miserable day on Anglesey, especially for many bank holiday makers, with drizzle and spots of rain throughout and no sunshine. (Frittenden 24.2C Kinbrace Min 4.2C Upper Lambourn 24.2 mm Lake Vyrnwy 21.0 mm Manston 5.9h Aberdaron 0.8h) [Max 18.1C Min 12.1C rain 3.4 mm]. Folloeing rain after midnight there was fog here at dawn on the 30th and, though thinned to poor visibility, by 0900 GMT it was still dull and very damp with 99% RH with a temperature of 12.8C. Pressure 1013 mb was rising, low 999 mb was SW Iceland and there was an associated frontal cloud mass over Ireland. Becoming brighter with a glimpse of sunshine by 11 GMT before a narrow band of cloud moved across from the W with some showery rain falling from 14 GMT heaviest at 1535 GMT (15 mm/h). The sky cleared later on and it was fresher (chillingham Barns 21.7C Lerwick Min 7.5C Wick 11.0 mm Tiree 8.6h) [Max 17.7C Min 12.3C Rain 3.8 mm]. It was a fine and sunny morning for the last day of spring on the 31st after a mostly clear and cool night air temperature down to 8.0C and 4.5C on the grass, a reminder for the garden that chilly nights continue here until at least the second or third week of June. There was some warm sunshine in the afternoon when grass manitenance was undertaken managing to finish just before and a surprise sharp shower of rain at 1517 GMT (34 mm/h) (Heathrow 23.0C Katesbridge Min 0.6C Llysdinam 9.8 mm Leconfield 15.4h) [Max 19.7C Min 8.0C Grass 4.5C Rain 0.7 mm].

The month ended with a total of 48.8 mm of rainfall (67%) & [79%] of averages, least since 2010 and the 30th driest May in Llansadwrn since 1928. The mean temperature was 13.3C (+1.8) & [+1.6) of averages, highest since 2008 the second warmest May in Llansadwrn since 1979. A very sunny month, sunshine at Valley was 250.0h the fifth sunniest May on the Anglesey record since 1931.


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June 2017

Welcoming summer a painted lady butterfly on its favourite flower Phuopsis stylosa in the garden. AAAS - In support of climate scientists. June 1 - a fine and rather breezy beginning to the summer months. Pressure was on 1019 mb with a large deep low 981 SW Iceland resulting in a brisk SSW'ly airflow. A welcome visitor again today, first seen yesterday, was a painted lady butterfly we have seen in the garden feeding on Phuopsis stylosa, the Caucasian crosswort or large-styled crosswort, a low-growing, mat-forming, aromatic perennial that ia a 'must have' plant in the garden to attract butterflies. The painted lady would look at other flowers, but always returned to the Phuopsis. I like to think it has journeyed here via La Bonne Anse on the west coast of France where I have seen dozens in early summer migrating north. A photo of a painted lady on Phuopsis in the garden features on my website homepage (dated 6 June 2004), above left is a new photo. Rain bearing frontal cloud over Ireland moved across slowly across the irish Sea during the day and did not reach here until about 2200 GMT (Heathrow 25.5C Cardiff 24.0C Baltasound Min 2.6C Islay 19.6 mm Herstmonceaux 13.6h [Max 18.9C Min 11.6C Rain 10.0 mm]. Rain was light to moderate, heaviest at 0311 GMT, and ceased on the 2nd around 0700 GMT. At 0900 GMT cloud was low on the mountains, but visibility was good. pressure was on 1016 mb and a weak cold front, associated with the Icelandic low 983 mb had crossed Wales, but the sky looking lighter at 0930 GMT was yet to clear. The weather improved a little in the afternoon and was even better at the NE tip of the island of Anglesey at Point Lynas, that was just beyond the back-end of slow moving frontal cloud, where it was sunny (Gracesend 26.8C Usk 19.3C Castlederg Min 5.7C Andrewsfield 18.2 mm Belfast 11.4h Aberporth 7.6h [Max 17.4C Min 11.7C Rain nil].

United States President Trump finally confirmed that the US would pull out of the Paris Climate Agreement. This was predictable, but shows his intransigence, complete mis-understanding of the facts, and unwillingness to accept what the world's and his own scientist say. Former US President Obama in a statement said ' A year and a half ago, the world came together in Paris around the first-ever global agreement to set the world on a low-carbon course and protect the world we leave to our children. It was steady, principled American leadership on the world stage that made that achievement possible. It was bold American ambition that encouraged dozens of other nations to set their sights higher as well. And what made that leadership and ambition possible was America’s private innovation and public investment in growing industries like wind and solar – industries that created some of the fastest new streams of good-paying jobs in recent years, and contributed to the longest streak of job creation in our history. Simply put, the private sector already chose a low-carbon future. And for the nations that committed themselves to that future, the Paris Agreement opened the floodgates for businesses, scientists, and engineers to unleash high-tech, low-carbon investment and innovation on an unprecedented scale. The nations that remain in the Paris Agreement will be the nations that reap the benefits in jobs and industries created. I believe the United States of America should be at the front of the pack. But even in the absence of American leadership; even as this Administration joins a small handful of nations that reject the future; I’m confident that our states, cities, and businesses will step up and do even more to lead the way, and help protect for future generations the one planet we’ve got'. The UK, EU and many other countries remain committed to the Agreement...

Porth Eilian and Point Lynas Lighthouse.


Porth Eilian - Trywyn Eilian. Pair of Choughs at Point Lynas, Anglesey.

At Porth Eilian at the north-east corner of Anglesey (left) is sheltered from easterly winds by Point Lynas with its iconic lighthouse, it was a mostly sunny afternoon. The Point is the home of several rare Chough (right) its black plumage identifies it as a crow, but it has a red bill and legs unlike any other member of the crow family, Chough are also seen at South Stack and other parts of West Wales and Ireland. Prominent also here in June is the sea pink or thrift Armeria maritima ssp maritima,, also in the photo and here Sea pink growing on the cliffs at Point Lynas. on the outer cliffs of the Point. Also, beginning to flower, in the short grassy sward on the escarpment and precipitous cliffs , was Scilla verna the spring squill Spring squill (Scilla verna) at Point Lynas. . The Point has not been grazed since before 2004; the vegetation, particularly at Cyllell Lanw, on the north-west corner, which is the most exposed and salty place, is where only plants tolerant of salt spray (halophytes) can survive include a glaucous subspecies of creeping red fescue Festuca rubra The salty grass sward at Point Lynas. . . Seen there also was a painted lady butterfly The short salty grass sward at Point Lynas. and here in close-up on birds foot trefoil Close-up of painted lady butterfly at Point Lynas. . . Go here for my 2004 account of the plants of Point Lynas.

XXXXX. The present lighthouse was built in 1835 by the Mersey Docks and Harbour Board at a cost of £1,165. The lighthouse is a low castellated structure painted white with the round lens room connected to the seaward side of the building. Trinity House assumed responsibility for Point Lynas Lighthouse on 2 April 1973 and is now monitored and controlled from Trinity House’s Planning Centre in Harwich, Essex, after the sale of the building in which it is housed. It appears still to have equipment on the roof including a radar system that was not rotating. Unlike its former state when looked after by resident lighthouse keepers the use and repair of the building seems to have had a chequered history. Currently it is looking in a sorry state with an attached abandoned block building, apparently partly blown over by the wind, and looking a real mess Apparently abandoned building work at Point Lynas. - such a pity as the Point is one of the top Anglesey attractions as well as an oustanding ecological habitat. New this year is the National Coastwatch Mobile Unit, transferred from Morfa Bychan where it was spoiling the view from the golf course of the “two castles” which they market internationally. Staffed by volunteers the location at Point Lynas seems to me to be a very good choice as it has a good view of the busy shipping lanes and small craft passing close inshore usually at slack water Small craft passing Pt. Lynas near slack water. . It has a Davis Vantage Vue AWS, as used at Gorwel Heights, fixed to the roof on a short mast .

It was another fine morning on the 3rd, but cumulus clouds were already beginning to develop at 0900 GMT. Pressure was steady on 1014 mb with low 989 mb S Iceland and a frontal-wave disturbance 1011 mb off Newcastle over the North Sea. There was a fresher feeling SSW'ly breeze and visibility was good or very good with light haze. About 1115 GMT there was a short sharp shower, but the afternoon cleared up again and the evening was clear and sunny (Frittenden 22.2C Hawarden 19.8C Braemar Min 0.2C Leconfield 24.8 mm Morecambe 13.7h Aberporth 11.8h) [Max 17.0C Min 8.9C Rain trace. The 4th was also fine, bright and breezy, with little pressure change low 993 was slow-moving S Iceland and pressure high 1028 mb near the Azores. Hardly noticeable on the chart was a small frontal-wave low 1011 mb W of Cap Finisterre/ S of Iceland which by 1800 GMT was SW of Ireland 1002 mb. It was cloudier around middle of the day then sunny later and in the evening. During the afternoon pressure began to fall 1012 mb at 1800 GMT then more rapidly in the evening to 1009 mb. A cooler day everywhere - (Holbeach 20.7C Kinbrace Min -0.1C Pembrey Sands 13.8 mm Herstmonceaux 12.5 h) [Max 16.6C Min 9.3C Rain 13.2 mm]. Rainfall accumulated 48-h up to 18 GMT on 6 Jun 2017. SYNOP & local PWS sources.Moderate to heavy rain began at 0200 GMT (heaviest 39 mm/h at 0716 GMT) and by 0900 GMT on the 5th had accumulated 13.2 mm. It was a miserable dull and wet day; more or less continuous light rain with heavy bursts and by 1800 GMT there was another 15.6 mm had fallen 28.8 mm in all. There are many fledgelings around the garden; including sparrows, chaffinches and goldfinches and the wet may be a problem for them although there is shelter in the woodland. Worst hit could perhaps be the parents whose feathers are not in the best of condition at this time of year; the male pheasants looked particularly wet and bedraggled at the end of the afternoon. A yellow warning of heavy rain in Wales had been issued by the Met Office. Natural Resources Wales issued flood alerts for those living close to the river Conwy, the rivers Loughor and Amman, the rivers Gwendraeths, river Glaslyn and river Dwyryd. An alert has also been issued for north Gwynedd and for the whole of Anglesey. Pressure fell to 987.4 mb at 2242 GMT as the centre of the Welsh low passed over. Rainfall in Llansadwrn since midnight totalled 45.4 mm (Shoeburyness 19.7C Resallach Min 2.7C Capel Curig 68.6 mm Llansadwrn 33.4 mm Manston 8.5h) [Max 14.3 Min 10.6C Rain 37.8 mm]. Another 5.6 mm fell after midnight (heaviest 11.6 mm/h at 0349 GMT) but had eased to a few spots by 0900 GMT on the 6th (D-Day). A very dull, cold and wet morning with a moderate to fresh WSW'ly wind. Rainfall in the event so far had totalled 51.0 mm over 28 hours duration. It was looking a little brighter by 1030 GMT and there was a patch of blue sky at noon, and the afternoon though breezy was mostly sunny (Bournemouth 17.8C Porthmadog 17.0C Okehampton Min 7.0C Edinburgh Bot Garden 65.2 mm Swyddffynnon 36.0 mm Aberdaron 11.1h) [Max 16.2C Min 8.8C Rain 16.0 mm]. This red squirrel is a frequent visitor at the weather station. A bright morning an a bit of a respite day while pressure 1011 mb was rising on the 7th in a minor ridge over Ireland from a high 1025 mb near Biarritz, France, as yesterday's low moved over the North Sea. Opportunity to mow the grass as it is growing quite quickly, with a reasonable moisture level 56 % dry mass after the rain, at 7.9 g dry mass m -2 d . I had just finished and the first spots of rain of the next system began about 1500 GMT, nothing much at first then slight rain at 1640 GMT turning moderate to heavy in the evening easing a little before midnight when 7.6 mm had fallen. Today for the first time half of the UK electricity generation was by nuclear, wind, hydro and solar, fossil fuels making up the other half (Heathrow 20.9C Killlylane Min 6.2C Wick 38.2 mm Scolton C.P. 19.6 mm Glasgow 11.8h Valley 7.9h) [Max 15.9C Min 9.7C Rain 16.0 mm]. More moderate to heavy rain after midnight (8 mm/h at 0344 GMT) on the 8th with pressure 999.9 falling rapidly at 0900 GMT but soon bottomed out at 999.7 mb at 0924 GMT. There was another low 992 mb W of Ireland and we had a rather showery and breezy morning with poor visibility. At 14 GMT today UK electricity generation on the National Grid from non-fossil sources was 47%. In addition we were importing 5.9% from France (which is largely nuclear 80% and hydro 15%) and 3% from Holland. A slight shower around 15 GMT then a fine evening (Manston 20.5 Altnahara Min -2.3C Lough Fea 38.8 mm Capel Curig 35.4 mm Atnahara 8.2h) [Max 15.9C Min 9.7C Rain 16.0 mm]. Dry and partially clear overnight with air minimum 11.3C and a mostly cloudy dawn on the morning on the 9th as a shower trough passed over. I did not see any rain from this and by 0900 GMT the sky with numerous cumulus clouds was clearing giving a mostly sunny morning. Pressure 1007 mb was rising with a minor ridge as low 996 mb Wick, NE Scotland moved away. The next low in line for us to the W was 964 mb and S of Greenland. Sunshine continued in the afternoon before cloud encroached later with rain coming along in the evening [Max 17.9C Min 11.9 Rain 12.8 mm]. Rainfall in the first 10-days of June 2017. A wet and windy start to 10th with very poor visibility the low cloud base <800 ft. With low 973 mb W of Shannon, Ireland, pressure here was 1008 mb. Pressure was high 1022 mb Germany and 1019 mb and all over France it was a fine and sunny morning. Rainfall for the first 10-days of June at noon was 104 mm, having the distinction of being one of the 20 Junes with more than 100 mm in Llansadwrn since 1929. Also, the 104 mm in the first 10-days made it the wettest at this station by a long way in over 38 years, the 17th wettest so far. Rain continued into the afternoon becoming slight and drizzly. A small funnel cloud was seen over the Great Orme during the morning (Santon Downham 24.8 Cardiff 20.8C Aboyne Min 6.8C Capel Curig 30.8 mm Shoeburyness 11.7h Aberporth 1.8h) [Max 16.2C Min 12.7C Rain 4.3 mm]. A showery morning on the 11th it was brightening up at 0900 GMT, but there was rain in sight looking towards the mountains. Pressure was on 1008 mb with Atlantic low 984 mb between N Ireland and Iceland, W of Scotland. There was a very blustery strong to gale-force SSW'ly winds that was bending out tall trees and it was very noisy with live twigs and leaves being broken off and littering the ground. Bright with glimpses of sunshine and slight showers in the afternoon and at 1930 GMT, but of little volume. The wind moderated through the night. Wet in Scotland (Heathrow 23.9C Drumnadrochit Min 7.9C Tyndrum 27.4 Leconfield 9.4h Aberdaron 9.0h) [Max 16.2C Min 11.6C Rain 0.2 mm].

After a mild night minimum 11.6C the 12th began a little brightly after a slight shower at 0300 GMT, even a glimpse of sunshine, but by 0900 GMT it was with overcast and dull with the mountaintops obscured. Pressure 1015 mb was rising quickly with the low 995 mb over the Orkney Islands heading rapidly for Norway. It was fine, but feeling cool in the still moderating force 4 SSW'ly breeze. A little brighter just before 14 GMT, otherwise it kept dull. Cooler in the south-east, wet in Scotland (Heathrow 20.9C Okehampton Min 8.8C Cluanie Inn 31.0 mm) [Max 16.1C Min 11.6C Rain 0.1 mm]. Overcast again on the 13th and mild overnight, cloud and mist was low on the mountainslopes in good visibility. Pressure was on 1018 mb in a transient ridge reaching Scotland from high 1020 mb over the English Channel. A low 977 mb was S of Greenland and W of Scotland tracking eastward. Dull and cool with glimpses of the sun behind cloud the dark cloud thick enough in the afternoon to produce spots of rain at times. The north from North Wales was mostly cloudy while to the south it was clearer and sunny with summer temperatures (Heathrow 24.8C Achnagart 19.8 mm Gogerddan 4.8 mm Bournemouth 15.2h) [Max 16.8C Min 12.1C trace].

The 14th had the promise of some finer weather although the morning starting brightly was beginning to turn cloudier at 0900 GMT with pressure falling. A light SE'ly breeze at first with good hazy visibility. From noon the cloud thinned and it was sunny the temperature rising to 22.1C at 1429 GMT. Warm too in Llanfairfechan with Gorwel Heights reaching 22.2C at 1650 GMT when cooler air on a cold front brought an initial 5.5C plunge, 7C in Llansadwrn. There were breaks in the cloud also in the west in the afternoon with some sunshine at Aberffraw where a few northern marsh orchids were seen at their best. There were more pyramidal orchids flowering, but most smaller than usual this year. The dune slacks were moister after the rain and the first marsh helleborines were beginning to appear, none of the flowers fully open as yet. An unusual amount of seaweed was being stranded on the beach along with 2 or 3 small jellyfish. Thicker frontal cloud encroached during the evening (Heathrow 27.1C Hawarden 25.0C Bournemouth 15.1h) [Max 22.1C Min 11.1C Rain 2.0 mm]. There was a moderately heavy shower of rain at 0418 GMT on the 15th and by 0900 GMT the sky was clearing with some sunshine. It was again breezy with a moderate SSW'ly and a temperature of 14.7C. Pressure was 1012 mb with shower troughs to the W and complex fronts associated with lows 991 mb S of Iceland and 985 mb S Greenland. The day kept fine and breezy with some sunny spells (Manston 26.0C Exeter Min 7.0C Tyndrum 22.0 mm Reading 12.9h Aberporth 12.0h) [Max 17.4C Min 12.4C Rain nil].

It had been a wet start to the month the first 15-days had 107.2 mm of rainfall which was (131%) & [159%] of the averages. Temperatures had been close to the averages with the mean 14.0C (0.0) & [0.1].

The 16th began dull, but fine and breezy. A warm front lay over the Irish Sea associated with low 988 mb S Greenland. Pressure 1023 mb, however, was rising with a high 1029 mb over the SW Approaches off Brest. The morning brightened and the afternoon though cloudy had sunny spells (Heathrow 24.3C Porthmadog Min 8.0C Harris Quidnish 6.4 mm Camborne 11.6h) [Max 19.9C Min 10.7C Rain nil]. The 17th was a very fine day, sunny and warm with little in the way of cloud cover and solar radiation 26.96 MJ m -2 highest of the year with 15.1h of sunshine recorded at RAF Valley (Heathrow 30.1C Libanus Min 8.8C Achnagart 24.2 mm Boulmer 16.0h) [Max 23.2C Min 14.6C Rain nil]. Pressure was steady on 1024 mb on the 18th with and another almost cloudless day. High 1026 mb was situated over the Severn estuary, visibility was very good and clear and it was very fine and warm. Hotting up in the south (Hampton WW 32.1C Ravensworth Min 6.7C Achnagart 8.0 mm Morecambe 16.2 h) [Max 24.7 Min 13.4C Rain nil]. The 19th was a lot cloudier, mostly high thin cirrus, so that the day was bright with a lot of sunshine and warmer (Hampton WW 32.5C Eskdalemuir Min 7.1C Lentran 5.8 mm Morecambe 15.1h) [Max 26.6 Min 13.4C Rain nil].

View of Snowdonia Mountains across Aberffraw Bay from Braich-lwyd.


With pressure on 1020 mb on the 20th the day began fine with cloud clearing over Anglesey except for a persistent band of cloud over the eastern Menai Strait with the mountaintops showing clear. Pressure was high 1022 mb with the high 1024 mb over northern Britain, a weak frontal system had been making its way S over night. Saharan dust deposited on my clean car. Sample of Saharan dust collected wet  at 1830 GMT. The day turned out top be very fine and sunny, though a little fresher, ideal for walking the Llewelyn (Llywelyn) Heritage Path around the headland at Aberffraw where there were good views across the Bay to the mountains of Snowdonia, Llyn Peninsular and Bardsey Island (panorama photo above). Very warm in the south (Heathrow 31.4C Cardiff 30.7C Tulloch Bridge Min 0.0|C Prestwick 15.1h Valley 14.3h) [Max 22.7C Min 12.7C Rain 0.1 mm]. With warm dust-laden air moving into southern Britain the 21st proved to be the hottest June day since 1976 with 34.5C recorded at Heathrow and 31.0C in Cardiff. In Llansadwrn it was 29.9C, highest in 38 years of records, while in Llanfairfechan Gorwel Heights had 30.5C and Gorddinog 30.4C. Llanfairfechan's 30C received a mention on Derek Brockway's BBC Wales evening weather slot. There had been some rain overnight, around 04 GMT and there were large spots of rain around 0745 GMT that appeared dusty. More spots of rain or drizzle fell after 0900 GMT until 1030 GMT when it cleared. This rain resulted in the deposition of a pale whiteish pink dust. Backward trajectory analysis of air arriving over Anglesey at 1400 GMT on 21 June 2017. Researched on the NOAA ARL Website.After sunshine when the high temperature occurred there were more spots of rain and drizzle from 1400 GMT petering out by 1830 GMT which resulted in a further deposition a darker pinkish white dust, when a sample was collected wet (photo above left) and was also seen drying on my 'clean' car (above right). Backward trajectory analyses using the HYSPLIT dispersion model, courtesy of the NOAA ARL Website indicated that parcels of air arriving over Anglesey between 3000 and 4000 m AGL at 1400 GMT originated in the Sahara desert in north Africa (graphic left). Much dust was being raised in Algeria on the 14th, and subsequent dates, and dust could be seen on MODIS satellite images near and off the coast of southern Morocco and Agadir, north of the Canary Islands on the 19th (a TERRA image) near the trajectory tracks of air arriving over Anglesey today the 21st being washed out in the rain (Heathrow 34.5C Cardiff 31.0C low max Lerwick 12.6C Min Altnaharra 3.2C Strathallan 12.6 mm Lake Vyrnwy 0.6 mm Manston 13.5h) [Max 29.9C Min 15.7C Rain 0.5 mm].

What a difference one day can make. On the 22nd with the onset of cooler weather from the NW, the temperature at 0900 GMT was 13.7C and it struggled to get briefly to a maximum of 17.2C at 1437 GMT, 12.7C lower than yesterday. Apart from a little brightness and dryness at this time the day was wet and misty with poor visibility. This ended the 5-day run of warm (>20C) summer days (graphic from AWS left). AWS temperature and dewpoint 17-23 June 2017.The hot weather kept continued in the SE where thunderstorms developed during the day (Manston 27.2C Lerwick 10.2h) [Max 17.2C Min 13.7C Rain 5.1 mm]. And, more of the same on the 23rd with grey skies, rain and poor visibility after rain in the early hours and dawn with little change through the day. Low 977 mb was SE Iceland introducing a complex series of frontal bands of mostly light rain and drizzle, and a blustery moderate to strong SW'ly wind into the north-west. Somewhat drier in the afternoon then further light to moderate rain in the evening. In the 24-h to midnight 9.2 mm had fallen, this brought the total for the month so far to 119.4 mm, the 12th wettest June in Llansadwrn since 1929 (Heathrow 24.9 Monks Wood Min 9.4C Gogerddan 18.8 mm Aberdeen 12.7h) [Max 15.4C Min 11.1 Rain 6.5 mm].

Weak cold fronts passed overnight and the morning of the 24th was dull, cool and damp. Pressure was steady on 1013 mb with a low 978 mb W of the Faeroes over the Norwegian Sea while we had frontal cloud over the Irish Sea associated with a frontal-wave W of Ireland. The afternoon was breezy, but some sunny spells developed and the temperature rose to 18.4C and was warm into the evening (Santon Downham 25.5C Aboyne Min 6.2C Cassley 18.6 mm Morpeth 11.9h) [Max 18.4C Min 11.2C rain 1.3 mm]. The 25th began dull with slight rain and moderate misty visibility. The afternoon brightened allowing lawn management to be undertaken, grass growth had slowed to 3.4 g dry mass m -2 day -1 . This does not seem like a lot in these terms, but the yield of grass accumulated this season so far amounts to 5.32 tonnes per hectare. Soil moisture content under grass (2-10 cm deep) determined today was 44% dry mass, down from 56% at the beginning of the month, while the top 2 cm of soil that includes plant bases and dense roots was 68% dm. Growth of grass has been 'middle of the road' this season, range 3 to 8.5 tonnes over the past 15 years. (Heathrow 24.2C Altnaharra Min 6.6C Cluanie Inn 15.8 mm Morpeth 12.4h) [Max 17.4C Min 11.7C Rain 0.1 mm]. There was a fine and bright start to the 26th with a NE'ly breeze, but it did not feel cold with a temperature of 15.1C (dewpoint 11.7C) at 0900 GMT. A better day here than the forecasts had suggested with some warm sunshine in the afternoon, but nothing like the continued summer warmth in the south. Rainfall this month so far totalled 130.2 mm with a ranking of 7th wettest in the Llansadwrn record book since 1929 (Hampton 25.4C Katesbridge Min 0.0C Derrylincornahoule 7.4 mm Manston 14.3h) [Max 17.5C Min 10.8C Rain 9.4 mm].

A blustery morning on the 27th and mostly cloudy after a glimpse of sunshine before 0900 GMT. Pressure 1006 mb was falling with a low 1001 mb near Shannon, Ireland. Rather ragged low clouds and occasional thinner patches was the best on offer, but with a S'ly wind the temperature 15.6C rose to 19.4C by 1300 GMT. Thicker cloud then came came along and there was a little drizzle (Thomastown 23.4C Lerwick Min 4.4C Dundrennan, Scotland 52.2 mm Valley 17.0 mm Thomastown 5.4h) [Max 19.4C Min 13.2C Rain trace]. Where has our summer gone? The 28th began fine with a little brightness with a large area of rain just to the E of here, there was another area of rain over W Ireland, SW England and S Wales. Where has our summer gone? Pressure was on 1000 mb with lows 1001 mb Shannon, 995 mb Dover Strait and 998 mb Biscay, a complex dismal scene for a large part of Europe including France. For fine weather head for the eastern Med where it is rather hot at the moment. Slight rain and drizzle arrived here early in the afternoon and continued through the day that remained sunless (Achnagart 19.1C Baltasound Min 8.0C Lake Vyrnwy Min 11.2C Middle Wallop 58.8 mm Usk 22.6 mm Stornoway 11.8h) [Max 14.1C Min 13.4C Rain 5.8 mm]. On the 29th the weather was no better. With a low centre 990 mb over the North Sea near Hull the east coast was bearing most of the wind and rain it being a little drier here with just drizzle and slight rain. It continued to be bad weather on the Continent with France, except the Cote d'Azur, very stormy. A wet morning with very poor visibility and a temperature at 0900 GMT of 10.9C after an overnight minimum of 10.0C. Rainfall anomalies in June at Llansadwrn since 1929. A sunless day: global solar radiation 2.92 MJ m -2 was lowest of the month. The rainfall total is now 136.0 mm putting this June as the 6th wettest since 1929, so far, and [193%] of the 30-y average (Gravesend 22.3C Santon Downham Min 6.2C Scolton CP 26.2 mm Tiree 8.2h) [Max 12.3C Min 9.9C Rain 6.3 mm]. Another wet and sunless day on the 30th to end this strange month of June. Very dull and cool again: global solar radiation with 3.31 MJ m -2 was second lowest of the month. The weather is poor too all over France and very hot in the eastern Med. The 1.3 mm of rain today brought the total for the month up to 143.6 mm, the 6th wettest June here in Llansadwrn since records began in 1929. Not the wettest, according to the records, this was in 1935 when 196.3 mm fell (Gravesend 22.3C Santon Downham Min 6.2 mm Scolton CP 26.2 mm Tiree 8.2 h) (Max 14.6C Min 10.8C Rain 1.3 mm]

The month ended with a total of 143.6 mm of rainfall (178%) & [212%] of averages, most since 1998 and the 6th wettest June in Llansadwrn since 1929. The mean temperature was 15.0C [(+1.1)] of averages, equal highest (with 2016 and 2010) since 2006 the warmest June in Llansadwrn.


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July 2017

Close up of marsh helleborines at Aberffraw, Anglesey.July 1 - began fine, sunny and warmer as the sky was clearing after being overcast at dawn perhaps hinting of some better weather this month. Pressure on 1018 mb was rising slowly in a transient , but low 996 mb S of Iceland tracking E had complex fronts lying to the W which did not look promising. The river in The Dell at Bodnant. The fronts moved across later in the afternoon, just some spots of drizzle at 1515 GMT and after 18 GMT some light rain. Visited Bodnant garden today where the herbaceous borders were looking very good. A lot of new planting has been done in recent years and new parts of the garden opened up. A new development has been the establishment of 3 large meadows, on former grazed fields. Furnace Meadow open this year is shown below left (Wellesbourne 24.0C Usk 22.3C Altnaharra Min 0.1C Stonyhurst 4.2 mm St Athan 8.9h) [Max 17.0C Min 10.7C Rain 1.0 mm]. A fine and bright morning on the 2nd with a little sunshine at times, very good visibility with just a little haze. Pressure 1023 was rising in a ridge from Azores high 1032 mb. There was a CF over the Channel and a warm front over N France. Low 1003 mb S Iceland with frontal cloud over N Scotland. In between it was mostly fine with a warm sunny afternoon though breezy. Very hot still in the E Med with 46.8C recorded in Turkey (Thorney Island 24.1C Usk 23.5C Killylane Min 7.3C Cassley 21.8 mm Shobdon 14.5h St Athan 14.1h) [Max 18.0V Min 9.1C Rain 0.9 mm]. Furnace Meadow at Bodnant Garden. Some rain early on the 3rd around 0830 GMT and at 0900 GMT the cloud was lifting a little though it was still raining. Pressure was 1020 mb with low 1007 mb over the North Sea, there was a cloud mass to the NW of here with a frontal wave over the Irish Sea. Showery rain continued, briefly bright middle of day, but no clear sunshine, further slight rain later and in the evening of little volume.(Heathrow 25.1C Usk 23.1C Drumnadrochit Min 6.3C Cluanie Inn 5.8 mm Tiree 11.0h) [Max 17.5C Min 12.5C Rain 2.2 mm]. Much the same on the 4th after a mild night, minimum 12.9C and 12.5C on the grass' the sky was overcast and visibility very poor in slight rain and drizzle. Pressure was on 1018 mb with a low 1016 mb to the SW and a warm front over the Irish Sea. The afternoon was drier with a sunny spell before turning cloudy again later. I planted out three rows of module grown lettuce. The first in the spring had been entirely consumed by slugs, that are numerous again this year thriving in the warm moist weather, these were larger plants so perhaps they stand a chance (Manston 25.0C Usk 22.2C Altnaharra 1.1C Spadeadam 42.2 mm Stornoway 13.8h) [Max 19.0C Min 12.9C Rain 0.4 mm].

Marsh helleborines in flower on the big dune slack at Aberffraw.

Close up of marsh helleborines at Aberffraw, Anglesey.The morning of the 5th though mostly cloudy was brightish as cloud was thinning, visibility was poor and there was fog in the Menai Strait. Gradual improvement the afternoon becoming mainly sunny and warm. At Aberffraw the marsh helleborines were out in abundance on the big slack (above and left) and there were plenty of pyramidal orchids scattered about the fixed dunes areas. Wild thyme, some in large patches, was also now flowering an attracting severa insects including the six-spot moth. Bee orchids have not been seen this year. Wild thyme with six-spot moth on Aberffraw dunes, Anglesey. At the water's edge the air temperature was 22C and in the water it was 21C which was pleasant for swimming. One jelly fish was spotted stranded on the beach (Heathrow 24.5C Tredegar 27.1C Kinbrace Min 1.8C Albemarle 4.6 mm Shoeburyness 15.1h. [Max 20.6C Min 14.2C Rain nil]. The 6th began fine and mostly sunny with very good though hazy visibility. Pressure was on 1015 mb with a high 1021 mb North Sea and S Baltic region. There was a low 1013 mb near the Cherbourg Peninsula. Cloud developed here in the middle of the day returning to sunny spells later. Hot in SE England (Heathrow 32.2C Usk 27.7C Altnaharra Min 5.1C High Mowthorpe 35.4 mm Bournemouth 13.3h) [Gorwel Heights 24.8C] [Max 23.1C Min 14.2C Rain nil]. The 7th began fine and warm (17.7C at 09 GMT) though dull and it kept cloudy all day here and the NW. The cloud was thick enough in the evening for a spell of slight rain, the slugs will love it. (Heathrow 30.1C Shobdon Min 9.5C Aberdeen 13.2 mm Herstmonceaux 13.1h) [Max 19.2C Min 13.1C Rain 0.2 mm]. After a cooler night with fog from midnight to 0530 GMT after the cloud and fog had lifted the morning of the 8th was very fine and sunny, 5 oktas of cumulus, altocumulus and cirrus. There was a high 1021 mb over Cardigan Bay and pressure here 1020 mb. Fronts associated with Atlantic-low 1015 mb affected S England and Channel coast of N France. Sea holly within sight of the sea at Aberffraw dunes. There were storms and large hail affected Royan and Biarritz, extending eastward from Bordeaux, not good for the vineyards of west and central France. Here it was cloudier again around midday and the maximum temperature at 19.9C was not outstanding and it was a dry day (Teddington Bushy Park 27.3C Usk 27.6C Katesbridge 1.8C Harris Quidnish 20.2 mm Boulmer 15.6h Valley 11.7h) [Max 19.9C Min 10.8C Rain nil]. . On the 9th there was fog from 06 to 07 GMT then it cleared leaving a cloudy morning. Pressure was steady on 1013 mb and a low 995 mb North Sea had attendant rain-bearing fronts to the N over N Ireland and Scotland. A thundery low 1010 mb was over France. Some sunny spell developed in the afternoon and it was pleasantly warm. Bees are not taking a lot on interest in the broad beans, there are many flowers in herbaceous borders in the garden and they seem more interested in them. The numbers of bumblebees are low this year, and we are not seeing honeybees either at the moment. Runner beans are not yet flowering, but we now use self pollinating varieties that set better. Butterflies seen presently include red admiral, wall brown and comma (Heathrow 28.4C Usk 25.3C Katesbridge Min 5.9C Achnaharra 16.4 mm Bournemouth 14.4h) [Max 21.1 Min 13.2C Rain 1.0 mm]

The 10th was disappointing beginning overcast and dull with drizzle turning to slight rain. Low 998 mb was over the Norwegian Sea with cold fronts over the Irish Sea and W Wales. The day kept more of less the same with rain at times and poor visibility. Sunniest in the far N, wet in the SE (Gravesend 27.0C Tulloch Bridge Min 4.3C Manston 24.6 mm Lerwick 15.3C ) [Max 16.0C Min 12.5C Rain 3.9 mm]. The 11th began overcast, dull and wet with slight intermittent rain or drizzle. Pressure was high 1012 mb S of Iceland with pressure here was on 1007 mb. It was a cloudy scene, however, with an occluded front over the Irish Sea and N Wales associated with low pressure over the N Sea and Baltic regions. Not a lot of change for most of the day until later in the afternoon when it was brighter and drier with a glimpse of sunshine at times. Red squirrels were at both feeding stations at times through the day (Manston 21.5C Islay Min 3.6C Chivenor 34.6 mm St Athan 24.2 mm Magilligan 14.7h Valley 1.5h) [Max 16.4C Min 12.5C Rain 0.2 mm]. A much better day on the 12th with a clearing sky through the morning it was fine and sunny with very good visibility [Max 19.7C Min 11.2C Rain nil]. Pressure 1021 mb was steady early on the 13th in a minor ridge from Continental high 1024 mb, but started to fall before noon; the day started very fine with hazy sunshine and mainly cirrus clouds and a S'ly breeze, as pressure fell a weak cold front over the Irish Sea, associated with low 1002 mb Iceland, encroached during the afternoon. The front can be seen low on the horizon looking NW over Cwyfan Bay [Max 19.9C Min 10.9C Rain 4.6 mm]. ....

View north-west towards Porth Cwyfan showing approaching front on horizon.

The first 15-days had 23.7 mm of rainfall (24%) & [34%] of the July total.. Temperatures had been close to the averages with the mean 15.6C (0.0) & [-0.1].

After some early rain on the 16th cloud was lifting and the sky clearing to give some sunny spells. Pressure 1024 mb was rising with an Atlantic-high 1028 mb to the WSW with frontal bands clearing to the SE. Low 985 mb was N of Iceland while there was a thundery low developing over Spain [Max 19.5C Min 12.8C Rain trace]. The 17th was a very fine sunny and dry day. After a cool start with overnight minima 10.9C air and 8.0C on the grass, the temperature at 0900 GMT was 17.3C and rose to 23.1C in the afternoon [Max 23.1C Min 10.9C Rain nil]. The 18th was another very fine, sunny and warm day, there was more in the way of high cirrus clouds and a solar halo was seen at 0900 GMT. Warmer overnight the minimum 13.1C and with the breeze ESE'ly the temperature was 21.4C rising to 26.6C in the afternoon. Warm too in Llanfairfechan where AWS at Gorwel Heights reported a maximum of 25.9C and Gorddinog 28.3C with a low relative humidity of 36%. Valley also recorded 28.3C. Thunder storms developed over Cornwall and S Wales, distant rumbles of thunder were heard at 2045 GMT with sferics reported in the Irish Seas off Llyn [Max 26.6C Min 13.1C Rain 2.8 mm]. Showers of rain overnight, the heaviest at 0213 GMT on the 19th, briefly up to 39 mm/h. The Met Office had updated its yellow warnings and indicated storms affecting N Wales counties omitting Anglesey.Sferics captured at 1430  GMT on 19 July 2017. Courtesy of A fine and bright morning with some weak sunshine breaking though at 0900 GMT The temperature 19.2C dewpoint 17.5C RH of 90% so fairly muggy. Pressure falling slowly was on 1003 mb. A little sunshine before midday with the temperature reaching 24.1C. Visibility was good, though hazy at first, but became poor by afternoon. Thunder was heard at 1245 GMT and there was rain at 1255 GMT. By 1400 GMT thunder and lightning were closeby with heavy rain falling up to 43 mm/h. Sferics captured at 1430 GMT showed most were S and SE of the Snowdonia Mountains with some the Menai Strait and over S Anglesey including Llansadwrn. Rain continued intermittently, but thunder had ceased before 1500 GMT as the storms moved away north-eastward. There was flooding in towns along the coast including Rhyl, Abergele, Prestatyn, Rhuddlan and St Asaph where properties were damaged. A lightning strike on the Peniarth Arms in Tywyn caused a fire in a chimney stack. Many roads were impassable for a time at the height of the deluge. Intermittent rain continued during the evening and night (Cromer 27.8C Braemar Min 5.4C Rhyl 39.8 mm Stornoway 10.7h) [Max 24.1C Min 16.3C Rain 13.5 mm]. A much brighter day on the 20th with the sky clearing after dawn to give a mostly sunny morning. Pressure 1007 mb was rising with a cold front associated with low 991 mb S Iceland along the spine of Britain. The afternoon was breezy with some beefy convective clouds over Snowdonia. Fine and dry in Llansadwrn until a brief shower came along at 1645 GMT and as the breeze lessened it was a fine evening (weybourne 23.8C Castlederg Min 6.2C Wick 36.2 mm Tiree 12.0h) [Max 17.6C Min 10.3C Rain 7.3 mm].

The 21st was overcast, dull and wet. Pressure had been at a monthly low 998.8 mb at 0619 GMT with a slow-moving depression over Ireland 992 mb at 0900 GMT and here 999.4 mb. The temperature was 14.9C and under thick cloud and rain and or drizzle generally dropped from the maximum of 15.3C, a few minutes after 0900 GMT, through the day and following night. Very wet and windy in S Wales (Coningsby 23.1C Dalwhinnie 2.2C Tredegar 69.4 mm Mumbles Head 52 mph Kirkwall 14.6h) {Max 15.3C Min 11.4C Rain 5.1 mm]. A brighter day on the 22nd with pressure 1006 mb rising with a low 1001 mb over the Celtic Sea. Fine and sunny to start, although it was wet underfoot, and soon cumuli began to develop in the west. Mostly cloudy thereafter near the mountains until later in the afternoon when the sky cleared overhead for a while (Hull 22.5C Carslisle 50.2 mm Porthmadog 19.6 mm Aberdaron 12.0h Valley 10.1h) [Max 18.4C Min 9.7C Rain 0.2 mm] ...

The month ended with a total of 88.5 mm of rainfall (88%) & [127%] of averages, lowest since 2015. The mean temperature was 15.7C close to the averages, highest since 2014 ranking 18th since 1979. Sunshine at Valley was 194.9 h sunniest since 2014 and 14th on the Anglesey record since 1931.


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August 2017

August 1 - and a fine, mostly cloudy morning after a heavy shower of rain but, with pressure 1011 mb was rising, there was some sunshine later in the morning and in the afternoon . At times convective cloud thickened overhead and there were spots of rain. Away from the influence of the Snowdonia mountains Valley on the NW coast of Anglesey had 10.2 h of sunshine (Gravesend 24.5C Kinbrace Min 4.;4C Morecambe 29.0 mm Bala 18.6 mm Shoeburyness 12.8h) [Max 18.0C Min 13.0C Rain 1.0 mm]. The 2nd was another disappointing day with skies overcast and rain had been falling since 0550 GMT. The afternoon was drier with a little sunshine at times. Hawarden 22.9C Aboyne Min 4.5C Mt. Batten 26.0 mm Lerwick 10.4h) Gorwel Heights 22.0C Gorddinog AWS 21.6C [Max 19.2C Min 13.1C Rain 1.1 mm]. It was a very dark morning on the 3rd with thick cloud and windy. The SW'ly was force 6 on the weather side of the sheltering trees. Visibility was poor. Pressure had been 997 mb at 0451 GMT with a low 993 mb to the NW near the Western Isles and North Channel. The afternoon was brighter with a little sunshine (Holbeach 23.0C Rhyl 19.7C Baltasound Min 7.9C Capel Curig 35.8 mm Charterhall 7.9h) Gorwel Heights 20.1C [Max 18.0C Min 13.7C trace].

Aberffraw Bay with towering cumulus clouds E Snowdonia.


A more promising day beckoned on the 4th with pressure 1009 mb rising quickly. Low 994 mb was moving away over the S Norwegian Sea and there was some early sunshine. Towering cumulus clouds were in the vicinity and there were some spots of rain either side of 0900 GMT giving trace amounts for both 24-h periods. Otherwise fine with convection diminishing over Anglesey it was a mostly sunny day especially on the western shores of the island (Gravesend 23.1C Killylane Min 10.1C Harris Quidnish 17.2 mm Leconfield 11.9h) [Max 19.5C Min 13.0C trace]. The pressure 1017 mb was still rising on the morning of the 5th that began brightly although there were towering cumuli in the vicinity at 0900 GMT. Visibility was very good albeit slight hazy towards Llyn where approaching rain showers were evident. Sunny then a shower of rain here at 1035 GMT. There was a heavy shower at Gorwel Heights at 1239 GMT that fell at a rate of up to 165 mm/h and accumulated 12.2 mm with an overall 6C fall in temperature . The afternoon here was dry with some sunshine although there were passing cumuli at times (Writtle 21.9C Katesbridge Min 1.9C Keilder Castle 16.6 mm Morecambe 12.2h) [Max 18.1C Min 11.1C 1.7 mm].

The 6th began with overcast skies and a low 1006 mb west of Malin Head tracking NE that had a frontal-wave over Ireland. Breezy a S'ly force 5 strengthening to force 7 with strong down draft gusts especially in the Menai Strait causing problems for offshore dinghy racing that had already been shortened due to the conditions. One crew was rescued by the Beaumaris RNLI craft launched at 0945 GMT that also helped right seven capsized dinghies in rapidly deteriorating conditions. There were spots of rain from 1100 GMT then continuous rain all day into the night. Rainfall was 35.8 mm in the 24-h period from 0900 GMT over 15h duration. Heaviest was the 45 mm/h at fell at 2000 GMT. It's summer! (Cavendish 23.0C Kinbrace Min 1.9C Capel Curig 35.2 mm Shoeburyness 13.1C) [Capel Curig 45.8 mm Llansadwrn 35.8 mm] [Max 15.6C Min 10.5C]. Painted lady on Verbena bonaariensis in the garden. The 7th was a drying day [Piche PE 1.6 mm] beginning brightly with sunny spells and a cool light SW'ly breeze. Despite clouds looking threatening during the morning it was fine and dry in the afternoon. The National Eisteddfod was being held at Boderden on Anglesey this year. The heavy rain turned much of the grassy Maes into a quagmire, but many attending the Eisteddfod came prepared with wellies. Car parking was moved to an emergency 'park and ride' scheme that caused drivers about 2h delay. A good number of butterflies have been seen around the garden this season including painted lady (photo right), red admiral, peacock, comma, small tortoiseshell, small white, holly blue and speckled wood (Holbeach 22.7C Baltasound Min 5.0C Eskdalemuir 21.4 mm Aberdaron 12.2h) [Max 18.4C Min 11.1C Rain 9.5 mm]. A very wet dull and dark morning on the 8th with 9.5 mm of rain falling up to 0900 GMT leaving some standing water at the weather station. A blanket of grey clouds and moderate visibility the now slight rain stopping by 10 GMT as the system moved SE. With 49 mm so far there had been half a month's normal rainfall already (Frittenden 23.0C Porthmadog 20.7C Aboyne Min 3.1C Stowe 48.0 mm Milford Haven 34.0 mm Tiree 12.4h) [Max 17.1C Min 11.2C Rain 0.1 mm]. It had been dry overnight and the sky was clearing by the morning of the 9th especially to the E with the Great Orme in the clear. Pressure 1020 mb was rising quickly with a high 1032 mb W of Ireland. There was a moderate N'ly breeze and the temperature rising from 12.9C at 0520 GMT to 14.9C at 0900 GMT. By afternoon the sky was clear here and in the sunshine the temperature rose to 18.6C at 1419 GMT (Glasgow 20.5C Resallach Min 3.6C Kenley 44.6 mm Glasgow 13.5h) [Max 18.6C Min 12.2C Rain nil].

Continuing fine on the 10th with pressure steady on 1027 mb. We were in a ridge from Atlantic-high 1033 mb off Cap Finisterre. Though cloudy at times the day was dry, the afternoon fine with clear skies in the evening (Hereford 22.8C Swyddffynnon Min 2.6C Manston 10.6 mm) [Max 18.5C Min 10.6C Grass 8.0C Rain 0.3 mm]. In contrast the 11th began overcast with rain and drizzle from 0730 GMT. Pressure 1016 mb was falling with low 990 mb Norwegian Sea with a warm front over Wales. The day was dull and sunless with rain or drizzle at times, none particularly heavy but over 7 h duration [Wattisham 22.8C Shobdon Min 4.0C Capel Curig 13.4 mm Shoeburyness 10.6h] [Max 16.1C Min 11.1C Rain 2.6 mm]. Little change overnight and on the morning of the 12th that was dull with slight rain at times. Pressure, however, was rising and the rain slowly eased and eventually in the afternoon we saw a little sunshine (Frittenden 23.5C Loch Glascarnoch Min 6.9C Bencathra 8.9 mm Tiree 9.8h]. Corsican and Cornish heaths in flower in the garden. Buff tailed bumblebee on Corsican heath. The 13th was a much better day with early sunshine A high 1023 mb was off Brest, Brittany, influencing the weather of S Britain. Cool overnight the minimum 9.4C and 5.7C on the grass, with heavy dew formation, giving an autumnal feel. Fine and sunny, in the sunshine there were lots of honey bees on the flowering heather Mrs Maxwell and many buff tailed and tree bumble bees favouring the tall tree heathers both varieties now in full flower. The shorter (right) Cornish Heath Erica vegans, native of Cornwall, var. Mrs D F Maxwell a deep rose-cerise with dark green foliage, and a taller tree heather (left), the Corsican Heath Erica terminalis, having pink flowers. The Corsican starts flowering first, usually in July and both can carry on into October. The Corsican, tolerant of lime readily seeds itself but the Cornish needs to be propagated by cuttings. Both types are reasonably hardy and are well over 45 years old; we planted them when we came to live here. They stand up to moderate winds, but the Corsican did recently receive some damage in severe gales (Frittenden 23.8C Katesbridge Min 0.5C Kinlochewe 5.0 mm Heathrow 12.5h Aberdaron 8.2h) [Max 19.6C Min 9.4C Rain 6.9 mm]. Rain from midnight on the 14th had cleared by morning and there was a patch of blue sky to be seen at 0900 GMT. A blustery morning with pressure 1014 mb falling with a low 1006 mb near Malin Head and frontal systems over the Irish Sea. The temperature in warm air was 14.7C and there were glimpses of sunshine during the morning, but cloud thickened in the afternoon becoming overcast and there was slight rain from 1600 GMT becoming moderate to heavy during the evening (heaviest 2230 GMT). (Gravesend 25.0C Gorddinog AWS 21.2C Gorwel Heights 20.9C Aboyne Min 3.9C Killowen 31.6 mm Whitechurch (Pemps.) 29.6 mm Shoeburyness 11.0h) [Max 18.0C Min 12.7C Rain 13.7 mm]. After a shower of rain at 08 GMT the morning of the 15th soon brightened, but there were towering cumuli in the vicinity at 0900 GMT. Pressure 1013 mb was rising with a frontal wave over the North Channel. A thundery low 1011 mb over Normandy produced storms there and crossing the English Channel towards Dover; storms as well running from the Charente Maritime to central regions. Here sunny spells in the morning gave way to clear sunshine in the afternoon and evening (Shoeburyness 24.6C Altnahinch Filters Min 8.4C Fair Isle 28.4 mm Aberdaron 13.2h) [Max 18.3C Min 12.7C Rain nil]


The first 15-days had 72.8 mm of rainfall (73%) & [44%] of the August average total. Temperatures had been close to the decadal average but below the 30y average, the mean 15.6C (0.0) & [-0.6].

Cloudier overnight, but still bright with 5 oktas cover at 0800 GMT turning overcast by 0900 GMT 16th with a freshening S'ly breeze. Low 986 mb off W Ireland at 06 GMT was tracking N and 990 mb off the Western Isles. The morning kept dry, but breezy, the afternoon saw a glimpse of sunshine along with a slight shower of rain. Some heavier showers developed from 1830 GMT and vivid white lightning was seen across the sky as storms moved up St. George's Channel over Cardigan Bay towards S Snowdonia during the evening. Thunder and lightning here from 2225 GMT to 2330 GMT the storms then making their way over Liverpool Bay, Merseyside and Cumbria Gorwel Heights 21.1C (Heathrow 23.6C Aboyne Min 3.3C Lough Fea 15.0 mm Leconfield 9.0h)[Max 19.1C Min 12.3C Rain 4.7 mm]. A mild night and fine start on the morning of the 17th with some glimpses of sunshine. At 0900 GMT 15.9C with 97% RH. Pressure 1008 mb was rising with low 983 mb SE Iceland off Cape Wrath. A minor clear slot, then cloud developed midday and was thick enough for a few spots of rain at times. Some sunshine briefly later and into the evening, windy, then more showery rain came along (Cavendish 25.4C Katesbridge Min 5.0C Trawsgoed 30.0 mm Edinburgh 12.5h) [Max 19.0C Min 14.2C Rain 1.6 mm]. The 18th also began fine, but breezy, with a force 5 SW'ly. The jetstream was located over S Britain and with low 992 mb SE Iceland shower troughs were in the vicinity. Some sunny spells into the afternoon then a heavier shower at 1600 GMT sufficient to send me indoors from the garden. A sunny day NW Anglesey at coastal Valley (Cavendish 22.9C Kinbrace Min 6.1C Fyvie Castle 35.2 mm Sennybridge 25.0 mm Valley 9.5h). The 19th began dull and overcast with a cool feeling force 4 SW'ly breeze although the air temperature was 13.6C (dewpoint 10.9C) at 0900 GMT. Within 10 minutes there was a break in the cloud sheet, but showers were in sight crossing the Snowdonia Mountain range and Gorwel Heights caught it at 1010 GMT (20 mm/h) whereas we missed it altogether and a dry day ensued. The afternoon was bright at times and the wind moderated (Manston 21.3C Santon Downham Min 7.3C Cluanie Inn 39.6 mm Rhyl 8.6 mm Odiham 10.8h) [Max 17.1C Min (10.9C) Rain nil]. Fine and fairly bright morning, after a cool night 5.9C on the grass with moderate dew formation, on the 20th with some altocumulus overhead and a little weak sunshine. Pressure 1023 mb was rising. There was a ridge towards the UK from high 1026 mb over Biscay, but it was not to last for very long. Low 999 mb was S of Greenland and there were rain bearing fronts W of Ireland. Pressure was high 1021 mb Greenland and Spitzbergen while a low 998 mb near the North Cape was disturbing the weather in the Baltic region. A little brightness continued into the afternoon before rain set in about 15 GMT (Cavendish 21.8C Katesbridge Min 5.1C Resallach 18.2 mm Leuchars 10.2h) [Max 17.0C Min 9.8C Grass 5.9C Rain 3.9 mm].

The 21st began with overcast sky. Pressure was steady on 1020 mb with a slow-moving low 1005 mb W of Ireland and fronts over the Irish Sea. We were in moist warm sector air at 0900 GMT with a light shower of rain and a temperature 15.3C and 97% RH rising to 19.1C on what was an otherwise dry but sunless day (Usk 24.4C Tulloch Bridge Min 2.0C Shoreham 12.4 mm Kirkwall 9.1h [ Max 19.1C Min 11.9C Rain 0.1 mm]. There was early morning fog between 05 and 07 GMT on the 22nd and still very poor visibility at 0900 GMT. It was dull and humid at 0900 GMT with a temperature of 17.4C (dewpoint 17.1C) 98% RH. Fog lingered in the Menai Strait and was thick between the bridges and Bangor pier at 1000 GMT Somewhat brighter in the afternoon as the temperature rose to 23.0C just after 1500 GMT, the warmth continuing into the evening with the temperature 20.6C at midnight. Thunderstorms developed over N Ireland and the N Channel before moving on to the Western Isles. No thunder was heard here although sferics were recorded off Point Lynas. Malin Head had 77.2 mm of rain in the 24h to midnight (Bude 25.3C Porthmadog 24.9C Lough Fea 55.2 mm Lerwick 11.8h) [Max 23.0C Min 14.5C Rain 0.8 mm]. The 23rd began fine with misty good visibility, but breezy. Pressure 1012 mb was rising with a frontal low 1003 mb over the Western Isles. The afternoon was brighter with glimpses of sunshine (Weybourne 25.6C S Uist Range 63.2 mm Aberdaron 8.1h) [Max 18.4C Min 14.4C Rain 0.1 mm]. A fine, but dull and rather breezy morning on the 24th with some brief sunny spells developing later. Pressure 1015 mb was rising between low pressure 1002 mb to the NW and high pressure 1019 mb to the south. By afternoon the sky had cleared the sunshine continuing in the evening (Wisley 22.3C Braemar Min 5.6C Lerwick 25.0 mm Kirkwall 9.1h Aberdaron 9.0h) [Max 18.7C Min 13.6C Rain nil].

A dull morning with overcast sky on the 25th and with thickening cloud in moderate visibility rain was in sight. A little reached here soon after 0900 GMT, just some spots of drizzle. Fronts were lying to the NW with a low 1009 mb over the Western Isles while pressure here 1016 mb was rising. A chance of the cloud breaking appeared at one point, with a glimpse of weak sunshine, but the day kept cloudy and sunless (Monks Wood 24.6C S Newington Min 5.5C Helens Bay 29.2 mm Shoeburyness 12.9h) [Max 17.6C Min 13.5C Rain tr]. Grass of Parnassus growing on a dune slack in Newborugh Forest. A much brighter day on the 26th with the sky clearing at 0900 GMT although towering cumuli were seen to the SSE. Good visibility and with continued diminishing clouds a very fine sunny afternoon.; The maximum today was 20.5C while temperatures continue to be much higher in the S of England (Frittenden 26.3C Katesbridge Min 5.8C Aviemore 7.2 mm Aberporth 11.8h) [Max 20.5C Min 12.8C Rain nil]. Close up of the grass of Parnassus. Click for larger. The 27th did not start promisingly with the sky overcast. The morning was fine, but dull, with the temperature 17.4C at 0900 GMT. The afternoon slowly brightened and there were some sunny spells with the temperature rising to 21.6C. At Gorwel Heights 24.4C was reached at 1520 GMT. Although the evening turned cloudy it remained warm and was 13.8C at midnight (Kew Gardens 27.0C Rostherne Min 6.3C Harris Quidnish 5.4 mm Camborne 12.9h) [Max 21.6C Min 12.2C Rain 0.1 mm]. Cloudy again overnight and dull in the morning of the 28th, but visibility was good and there was a moderate S'ly breeze. At 0900 GMT the temperature was 16.2C and pressure steady on 1016 mb; the 06 GMT chart showed 5 fronts to the NW of here. The sky began to clear about 11 GMT and it was briefly sunny, more so in Beaumaris and Penmon. The afternoon was disappointing being dull and quite windy here, Bank Holiday visitors left the island early so the Britannia Bridge and A55 Expressway was very busy. Further E along the coast they found it was much sunnier and warmer (Holbeach 28.2C Cardiff 24.8C Wilmslow 23C Fair Isle lo Max 15.3C Achnagart 15.3 mm Anglesey Mona 2.8 mm Tibenham 12.6h) [Max 19.4C Min 13.8C Rain 6.1 mm]. Overnight it was mild with the temperature at midnight 15.6C (Gorwel Heights 16.6C) then as a cold front associated with low 974 Norwegian Sea passed over Anglesey the temperature dropped to a minimum of 11.7C at 0646 GMT. At 0900 GMT on the 29th the sky was clearing and visibility was a misty moderate to good. The clear slot was very small and it soon clouded over again making the rest of the afternoon dull before another glimpse of sunshine in the evening. A dry, but rather cool day the maximum 14.8C, a not particularly low August maximum for here, 14.5 degrees less that the south coast of England! (Frittenden 29.3C Braemar Min 4.5C Achnagart 9.8 mm Anglesey Mona 6.2 mm Lerwick 11.1h) [Max 14.8C Min 11.7C Rain nil]. Fairly cool overnight with the temperature on the grass down to 7.6C with moderate dew formation. There were signs of the sky clearing in the W on the 30th with bright and sunny spells at times. Cloud rather patchy and of variable cover with extensive cloudiness here (towering cumulus) mid afternoon then clearing again to give a sunny evening. Sunny on the west coast with 9.4h at Valley. A cooler day today even in the South. At 2330 GMT there was a burst of heavy rain that fell at a rate up to 61 mm/h and rumbles of distant thunder. (Helens Bay 19.7C Porthmadog 19.5C Aboyne Min 1.6C Culdrose 16.8 mm Valley 9.4h) [Max 17.6C Min xx Rain 3.8 mm]. On the morning of the 31st towering cumuli and cumulonimbus clouds were spotted. Visibility was moderate with mist, but the morning was fine and bright. Heavy showers and sferics were recorded to the N over the Irish Sea, Snowdonia and the Wirral to the E. We had some light showers about 1030 and 1120 GMT with some more sferics recorded at 1154 GMT off Point Lynas. Sunny at first in the afternoon when the maximum of 16.0C was recorded before some more cloud passed over (Hull 21.0C Eskdalemuir Min 2.4C Myerscough 28.2 mm St Athan 10.4h Valley 10.1h) [Max 16.0C Min 10.3C Rain 0.7 mm].

The month ended with a total of 96.0 mm of rainfall (96%) & [110%] of averages, lowest since 2015. The mean temperature was 15.2C close to the averages,lowest since 2015 ranking 16th since 1979. Sunshine at Valley was 175.3 h sunniest since 2015 and 22nd on the Anglesey record since 1931.

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September 2017

September 1 - began much as August ended mostly cloudy with sunshine at times. Fairly mild ay 12.9C and with pressure 1025 mb rising in a ridge from the Azores high 1028 mb. In the afternoon the sky did clear for a while and several butterflies including wall brown, speckled wood, small tortoiseshell and red admirals were seen in the garden. Red admirals were also seen along the hedgerows on ripe blackberries of which there are some good ones to be found. I collected enough for a blackberry and apple crumble. And, it was a dry day (St. James Park 22.0C Sennybridge Min 1.2C Waddington 13.8 mm Bude 12.5h Aberdaron 10.3h Valley 7.1h) [Max 18.0C Min 9.3C Rain nil]. The sky had cleared again overnight with mist forming in low-lying places by the morning of the 2nd that began very fine and sunny. There was still low cloud/ fog hanging over the western Strait and some cumuli had stated to form over the mountaintops. Weather outlook did not look good as a complex of lows and fronts lay W of Ireland tracking our way. Cloud did increase overhead mainly fair weather cumulus, but there was some good sunny spells late into the afternoon (Charlwood 22.1C Braemar Min 0.1C Writtle 12.4 mm Kinloss 11.5h Valley 0.1h) [Max 19.4C Min 12.6C Rain 6.0 mm]

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Graph of daily mean temperature. Graph of daily maximum and minimum temperatures. Graph of soil temperature at 30 cm depth. Graph of daily rainfall. Histogram of monthly rainfall compared with the long-term average. Histogram of accumulated monthly rainfall with comparisons. Daily global solar radiation in Llansadwrn (midnight to midnight) Anglesey sunshine: Source of original data (provisional) SYNOP reports Valley Met Office. Graph showing net yield of a mown grass ecosystem at the weather station. Red graph is total yield; Green graph is rate of growth. Comparison of annual grass production since 2004. Histogram of potential evapotranspiration and water balance. Soil moisture percentage (% dry mass).


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Graph of daily mean temperature. Graph of daily maximum and minimum temperatures. Graph of soil temperature at 30 cm depth. Graph of daily rainfall. Histogram of monthly rainfall compared with the long-term average. Histogram of accumulated monthly rainfall with comparisons. Daily global solar radiation in Llansadwrn (midnight to midnight) Anglesey sunshine: Source of original data (provisional) SYNOP reports Valley Met Office. Anglesey hourly mean wind wind: Source of original data (provisional) METAR reports Valley Met Office. Graph showing net yield of a mown grass ecosystem at the weather station. Red graph is total yield; Green graph is rate of growth. Comparison of annual grass production since 2004. Histogram of potential evapotranspiration and water balance. Soil moisture percentage (% dry mass).


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Graph of annual mean temperature and anomalies 1979-2016. No. of winter air frosts in Llansadwrn. Annual rainfall anomaly at Llansadwrn 1929-2014. Anglesey annual sunshine anomaly 1931-2014. Number of days with gales recorded in December and January on Anglesey.


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