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

Llansadwrn (Anglesey)

Latest Diary 2018
21st year

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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October 2018

October 1 - A very fine and bright morning with good visibility and a little haze. Pressure 1029 mb was rising and the temperature at 0900 GMT was 10.2C (dewpoint 7.7C) 85% RH. The afternoon was also bright with some glimpses of sunshine the temperature rising to 14.6C. There are slight to moderate autumn colours developing on beech and other native trees; horse chestnut are well coloured. Showery rain with intermittent slight rain and drizzle during the evening (Swanage 16.7C Shap -2.1C Dunstaffnage 20.0 mm Manston 9.2h) [Max 14.8C Min 4.4C Rain 2.0 mm]. Light showery rain continued after midnight on the 2nd, but had cleared away by morning leaving low cloud on the mountaintops of Snowdonia. Dry later and early in the afternoon with glimpses of sunshine then showers of rain came along between 16 and 18 GMT (Swanage 21.1C Baltasound min 5.1C & Rain 15.2 mm Leuchars 9.2h Aberdaron 0.8h) [Max 16.0C Min 9.9C Rain 1.2 mm]. With pressure on 1027 mb the 3rd began rather damp, but the sky was brightening nicely although cloud was slow to lift from the mountaintops. High 1030 mb was over Biscay and the Celtic Sea and we had a flow of warm moist tropical air. A mild 13.3C (dewpoint 13.1C) 98% RH and a SSW'ly breeze. Soon brighter with some sunshine in the afternoon (Exeter 21.1C Tulloch Bridge 2.6C Kirkwall 12.6C Bristol 10.4 h Aberporth 4.4h) [Max 16.6C Min 11.5C Rain 0.6 mm].

A remarkable day on the 10th beginning with cloudless skies and even at 0900 GMT the temperature was 15.4C often what one could expect in the summer. Temperature range Sun 7th to Wed 10th.Warm air was being drawn up from the Continent between low 982 mb over the Atlantic W of FitzRoy and Russian high 1030 mb. The breeze was also SSE and that meant the chance of a Föhn wind off the mountains which we did have. At 1320 GMT the temperature was 25.3C with relative humidity on 39%, the temperature was recorded both in the Stevenson screen and by the AWS. The sunshine and warmth continued through the afternoon to early evening when it still felt warm outside at about 20C. This temperature was the highest recorded at this station since 1979, the previous highest was the 24.5C on 13 October 1990. On Sunday 7th the air temperature had been down to 5.1C at 0229 GMT, in contrast today's high of 25.3C resulted in a 20C range over 3-days. Sunniest day of the month at RAF Valley with 10.2h of sunshine (Northolt 24.6C S. Newington 3.0C Stornoway 9.4 mm Lyneham 10.3h Valley 10.2h) [Max 25.3C Min 12.3C rain nil]. The morning of the 11th started brightly enough with 3 oktas cloud cover, but cloud was developing and he SSE'ly breeze strengthened and became blustery. Pressure was on 996 mb with Atlantic-low 975 Storm Callum W of Cap Finisterre tracking towards Ireland. There was showery rain from 10 GMT light to moderate at times during the day (Weybourne 22.9C Rhyl 18.1C Leeming 7.1C Pembrey Sands 36.2 mm Manston 7.5h Aberdaron 2.8h) [Max 17.7C Min 15.3C Rain 7.8 mm]. A rough stormy night as Storm Callum tracked N just W of Ireland. The 12th began wet and windy with gale force winds developing especially in the afternoon bringing down several trees and branches and disrupting the electricity supply. The 938 mb of the low was a probable record for October, here the lowest was 991.3 mb at 1259 GMT. There were very rough seas around the coast and at Rhosneiger; there was an 0.7 m surge on the high around noon. Rain persisted light to heavy through the day; 47.6 mm fell in the 24-h to 0900 on the 13th over 23 hours duration. The only dry hour was from noon! Some high gusts were recorded including one of 70 mph at Gorwel Llanfairfechan, 74 mph at Mona and 86 mph at Capel Curig. Very wet with severe flooding in South Wales (Cavendish 23.1C Rhyl 19.4C Altnaharra 2.1C Libanus 138.6 mm Wattisham 5.5h) [Max 18.3C Min 9.0C Rain 47.6 mm]. A very wet morning on the 13th with very poor visibility in heavy rain. There were some small pools of standing water around, but the ground is not yet saturated so there was little runoff. A light ENE breeze at first then a S'ly breeze soon picked up becoming moderate later. A dull sunless day. Flooding Llanwrst and Conwy Valley, mid and south Wales with people evacuated from their homes (Donna Nook 26.5C an October record Min Drumnadrochit 6.5C Shap 72.4 mm Libanus 71.0 mm Weybourne 6.5h) [Max 17.6 Min 13.2C Rain 17.0 mm]. The 14th began dull and damp after previous days' rain, visibility was good with a little mist and it was cool the temperature at 0900 GMT 9.4C (RH 95%). Pressure was on 1009 mb in a ridge UK and FitzRoy, there was a frontal wave lying over Biscay to the North Sea. Pressure was high 1033 mb over Russia. The afternoon cleared up with some sunshine as frontal cloud moved away to the SE, a dry day. Severe flooding in SW France in the Aude region with up to 20 persons killed [Carcassone 139.8 mm] (Manston 20.9C Porthmadog 17.2C Reading Uni. 36.2 mm Cardiff 15.4 mm Thomastown 8.7h Valley 4.9h) [Max 14.3C Min 8.6C Rain nil]. The 15th began fine and sunny with a light N'ly breeze. Cooler at 9.4C at 0900 GMT with pressure 1015 mb rising. A small high had developed over the UK while there was a low 997 mb near Cap Finisterre. Another low 974 mb S of Greenland would deepen and move eastward between Iceland and NW Scotland that would track northwards. A dry sunny day with the temperature falling to 9.0C at 1830 GMT there after rising temperature through the night (Herstmonceaux 20.1C Porthmadog 15.5C Aboyne -1.8C Hampton WW 30.8 mm Thomastown 9.7h Aberdaron 9.3h) [Max 13.8C Min 5.8C Rain 0.1 mm].

The first 15-days had 86.1 mm of rainfall (68%) & [67%] of the monthly average. Temperature were above average with the mean temperature 12.8C was (+1.4) and [+2.0] of the averages for the month.

It was back to dull and wet weather on the 16th, poor visibility with slight rain and drizzle in the morning. The temperature had risen overnight to 12.9C at 0900 GMT. Pressure was on 1013 mb with a low 967 mb S Iceland having various frontal systems over Ireland and the Irish Sea. There was some blue sky to be seen over Rhosneiger and this spread over to this corner of the island by the afternoon when there were interesting lee wave clouds to be seen S of the weather station (Santon Downham & Rhyl 17.3C Eskdalemuir 0.0C Achnagart 6.2 mm Capel Curig 5.4 mm Shoeburyness 8.7h Aberporth 3.3h) [Max 16.0C Min 9.0C Rain 2.3 mm]. A calm and misty moisty morning on the 17th with a little showery drizzle and slight rain in the morning. Pressure was however rising quickly and the band of slow moving frontal cloud drifted southwards by the afternoon allowing some sunshine to break through (Herstmonceaux 19.5C Usk 18.1C Aboyne 1.1C Achnagart 7.4 mm Belfast 8.0h Aberdaron 4.4h) [Max 13.3C Min 6.8C Grass 2.1C rain 0.3 mm]. A very fine morning on the 18th with 5 oktas cloud cover and a very light, but cool NE'ly breeze the air temperature at 0900 GMT 9.6C 83% RH. Pressure 1030 mb was rising with a finger of high-pressure over the UK from Azores high 1031 mb. There was an occlusion over the English Channel, but here bright with sunny spells, with a sunny afternoon. Local farmer Arwyn Jones, Plas, has won the Sheep Innovator of the Year competition at the British Farming Awards (St. Catherine's Point 17.4C Mumbles Head 15.9C Katesbridge -4.0C Lerwick 1.4 mm Morecambe 9.9h Aberporth 9.7h) [Max 15.6C Min 5.7C Rain nil]. A nice morning again on the 19th, mostly cloudy, but fine and bright with weak sunshine then bright sunny spells. A dry 24-h with a heavy dew on the grass at first before drying off in the light S'ly breeze (Mt. Batten 18.0C Milford Haven 17.1C Ravensworth -2.5C Achnagart 12.5 mm Waddington 8.9h) [Max 15.6C Min 5.7C Rain nil]. Continuing the fine spell the 20th began with few clouds and moderate hazy visibility. Pressure 1030 mb was still rising with high 1031 mb nearby over the Mendip Hills. Mostly sunny with the temperature rising to 16.1C in the afternoon here and to 18.2C at Gorwel Heights, Llanfairfechan The border country and England was misty with fog in places (Fyvie Castle 20.4C and 0.3C min, Dunstaffnage 10.2 m East Malling 9.5h) [Max 16.1C Min 10.8C Rain tr].

Well we had three fine and dry days so I can't complain too much when the 21st began overcast with slight rain and drizzle. Visibility was poor with a cold frontal system over Anglesey. The morning was dull, but the front cleared through by 1630 GMT (Cavendish 20.5C Usk 19.8C S. Newington 3.0C Achnagart 25.4 mm Porthmadog 6.4 mm Shoeburyness 9.5h) [Max 13.9C Min 12.1C rain 3 .8 mm]. The 22nd began with an almost clear sky and with the air minimum down to 5.5C and 2.5C on the grass there was heavy dew. It was calm with an intermittent N'ly air. There were one or two small cumuli to the NE over Red Wharf Bay and E of the Carneddau Mountains. Beautiful autumn morning, second sunniest day of the month at Valley having 8.5h; cleaned and sterilised the squirrel feeding boxes, they have been taking hazel nuts (Mt. Batten 15.2C Cardiff 15.1C Katesbridge -2.0C Baltasound 23.2 mm Exeter 9.5h St. Athan 9.1h Valley 8.5h) [Max 13.6C Min 5.5C Rain nil]. Back to the autumnal gloom under overcast skies on the 23rd, but it was dry though mostly dull with one brighter spell in the afternoon. Very red sunsets were reported in S. Wales and on Gower, not here though more's the pity (Inverbrevie 17.8C Usk 17.0C S Newington 0.5C Resallach 70.8 mm Boulmer 7.9C St. Athan 4.9h Valley nil) [Max 12.6C Min 7.8C Rain nil]. A similar morning on the 24th, overcast and calm or variable airs. Visibility just good and a temperature of 10.2C. Pressure was high centred off SW Ireland and on 1033 mb here. Low 979 was over the Baltic (Latvia) with a frontal system running down the North Sea. It continued fine here, but dull all day and it was sunless. Sunny mid Wales and S England (Gosport 19.7C Pembrey sands 2.8C Resallach 16.6 mm Lyneham 9.0h Lake Vyrnwy 8.9h Valley nil) [Max 11.9C Min 9.6C Rain trace].

Same again on the 25th the skies being overcast and almost calm conditions, there was smoke drift from the N. Soon the cloud was thick enough to produce drizzle obscuring the mountains above 1000 ft. The temperature hovered around 10C all day [max 10.7C] into the evening to midnight (Bridlington 16.9C Cardiff 14.0C Bournemouth -0.7C Resallach 23.6 mm Leconfield 7.9h St. Athan 5.2h Valley nil) [Max 10.7 Min 9.0C Rain 1.4 mm]. At midnight on the 26th the temperature began to fall as a cold front, associated with a low 1001 mb over the N North Sea, passed over Anglesey. Pressure 1015 mb at 0000 GMT falling gently to a low of 1013 mb at 0600 GMT. At 0900 GMT the temperature was 6.2C after a minimum of 5.5C at 0345 GMT. Fronts and frontal troughs moved SE across the UK introducing Arctic airflow from the N; with cumulonimbus in the vicinity there were recent showers of wet snow pellets here and of ice pellets at Gorwel Heights. In between some glimpses of sunshine then heavier showers of ice pellets at 1422 GMT (2-3 mm diam) and 1608 GMT enough to almost cover the ground producing little in the way of volume of water. Showers of rain and ice pellets were penetrated the Cheshire gap on to the Wirral during the morning (Swanage 12.8C Pembrey Sands 10.8C Tyndrum 0.4C Fyvie Castle 24.8 mm [Capel Curig 18.6 mm] Morecambe 7.8h [Valley 2.2h[ [Max 10.4C Min 5.1C Pptn 0.2 mm]. The 27th had a fine and bright morning with cooler temperatures; at 0900 GMT, 5.7C dewpoint 5.0C. The day kept dry, but it was breezy with high wind chill especially on the ramparts of Caernarfon Castle in the afternoon where fine views of the surrounding countryside and Anglesey can be obtained (Langdon Bay 10.4C Porthmadog 9.3C Sennybridge -3.3C Cromer 17.8 mm Prestwick 8.8h Hawarden 7.2h [Valley 7.0h] [Max 8.6C lowest of the month, Min 5.0C Rain nil].

Another very fine and chilly day on the 28th with 6.7C at 0900 GMT and a moderate drying E'ly wind. Sunny spells mitigated the wind chill especially in sheltered lanes, but where exposed up on the Llansadwrn-Gadlys ridge it felt very cold indeed although the maximum at 9.9C was a little higher today. Wet in the SE (Glasgow 11.4C Porthmadog 11.2C Gogerddan -3.8C Manston 19.4 mm Aberdaron 8.9h Valley 6.8h) [Max 9.9C Min 5.2C rain 0.2 mm]. The sky was almost cloudless on the morning of the 29th, it had been cold overnight the grass minimum down to -4.4C lowest of the month. There was expensive white frost on the grassy fields, the air temperature just 0.1C. There was early mist/ fog at Llyn Tegid, Bala. A sunny afternoon (Langdon Bay 10.7C Porthmadog 9.9C Katesbridge -5.9C Islay 11.2 mm Exeter 9.1h Aberporth 8.6h Valley 8.3h) [Max 8.9C Mon 0.1C rain nil]. Another fine chilly day on the 30th, again overnight frost -4.4C on the grass with an air temperature just 0.3C, calm with low inversion haze over the Menai Strait. At 0900 GMT pressure steady on 1001 mb with a temperature of 2.7C dewpoint 5.0C rising to 9.6C in the afternoon sunshine (Scilly 11.7C Shap -7.3C Mona -3.7C Manston 9.2 mm St. Athan 8.8h Valley 8.4h) [Max 9.6C Min 0.3C Grass -4.4C Rain nil]. The 31st and the last day of autumn began mostly cloudy and remained so all day. Breezy S'ly and drying the leaves and litter layer in the wood; there are a few bluebell corms showing green showing under the leaves. Pressure 1003 mb was rising with low 988 mb off the Western isles and an occluded front over the irsih sea. There were some very small spots of rain between 10 and 11 GMT but, did not wet the ground; there was a little sunshine here at times not so at Valley where it was sunless. During the evening there was rain here with thunderstorms in S Wales dying out and not reaching here. We were in rainshadow much of the time and did not have the large falls recorded elsewhere (Isle of Portland 14.5C Trawsgoed 12.8C Aboyne -6.5C St. Bees Head 23.4 mm Aberporth 21.6 mm [Valley 21.0 mm, Aberdaron 19.2 mm Mona 13.6 mm Capel Curig 8.4 mm Rhyl 3.6 mm ] [Max 11.0C Min 2.7C Rain 11.5 mm]

The 10th had an October record breaking maximum temperature of 25.3C. The mean temperature 11.1C was [(-0.1)] of averages lowest since 2015. The month ended with a rainfall total of 109.9 mm [(86%)] of averages, least since 2016 ranking 38 in Llansadwrn records since 1928. Sunshine at RAF Valley was 101.6h 129% of the decadal average.

November 2018

November 1 - A very fine and sunny beginning to the month here with very good visibility. Shallow advection fog on the old cricket field at Gadlys.Earlier there had been a low mist on the old cricket field, technically shallow advection fog. The grass minimum had been to zero and warmer air was blowing across the field from the NW. There were showers in the west of the island, but it kept fine here with a sunny afternoon. There was a slight shower of ice pellets during the late evening (Shoreham 14.7C Altnaharra -4.7C Mona 1.6C Wattisham 20.0 mm) [Max 10.7C Min 3.6C Grass 0.0C Rain 0.3 mm]. Light grass frost on the old cricket field at Gadlys.Another fine morning on the 2nd after an overnight ground frost -2.0C the fields showing a light white frost before the sun melted it. Similar time as yesterday, but no shallow fog today. Weak sunshine at first with some high cloud to the SE and towering cumuli to the W/NW and NE of the station. A fine day with some warm sunshine in the afternoon (Scilly 13.4C Milford haven 12.6C Katesbridge -6.2C Magilligan 13.6C Porthmadog 1.2 mm E Malling 9.1h) [Max 11.2C Min 1.8C Grass -2.0C Rain 0.5 mm]. The 3rd was a wet and very windy day the SSW'ly reaching gale force at times, but the mountains affording some shelter from the rain. Pressure 1014 mb was falling as ex-hurricane Oscar 954 mb S of Iceland and W of Scotland tracked NE. With pressure high 1031 mb over Belgium close to the UK isobars were tight. Frontal cloud lay over the Irish Sea. Pressure kept falling all day with rain at times and heavy just before midnight. At midnight Oscar 966 mb was steaming between Iceland and Scotland. Wet in Scotland and S of and upslope of the Welsh Mountains (Lossiemouth 17.9C Föhn Rhyl 14.4C Föhn Santon Downham -1.8C Achnagart 62.2 mm Whitechurch 32.6 mm Tibenham 5.6h Valley 0.0h) [Max 13.8C Min 4.4C Grass 1.6C Rain 8.3 mm]. The 4th was another dull and wet day with this part of the island enveloped in low cloud and drizzle heavy at times, there was brightness to be seen to the SE and Llanfairfechan had a much better day. Pressure 1006 mb was rising the lowest point was 1004.9 mb at 0252 in the night. Pressure was high 1020 mb over Spain while there was a low 1001 mb over the western Mediterranean. Frontal cloud over the Irish Sea sliding NE gave us the poor day. There was one brief brighter spell later in the afternoon when the drizzle eased for a while (Chivenor 15.8C Frittenden 3.8C Cardinham 21.4 mm Whitechurch 16.6 mm Magilligan 6.0h) [Max 12.7C Min 8.0C Grass 5.4C rain 7.7 mm]. Very good visibility with moderately high cloud with some breaks appearing at 0900 GMT on the morning of the 5th. It was calm with chimney smoke rising vertically, the mountains were clear and there was no snow to be seen. Pressure was steady on 1003 mb with a low 996 mb Biscay and 983 mb Greenland Sea. Frontal cloud lay over the Irish Sea, and it was raining in N Ireland, the cloud looked greyer in the west as it brightened up here by 1120 GMT (Otterbourne 18.3C Porthmadog 16.3C Tyndrum 3.4C Killowen 12.0 mm Manston 5.8h Valley 1.0h) [Max 13.5C Min 8.0C Grass 5.4C Rain tr].

The 6th began overcast with spots of rain at 0900 GMT. It was mild at 13.1C and an overnight minimum of 8.3C. A rather dull day, breezy at times, central England had mist and fog. The morning brightened up after 0930 GMT and with a SSE'ly Föhn-like breeze the temperature rose to 16.5C, Gorwel Heights 15.3C Valley 14.7C Mona 14.6C. Showery rain later in afternoon and evening (Manston 17.2C Trawsgoed 15.3C Braemar 2.0C Scolton CP 20.2 mm [Camborne 28.8 mm Capel Curig 13.4 mm Rhyl 1.6 mm] Weybourne 3.6h Valley 1.3h) [Max 16.5C Min 8.3C Grass 4.2C Rain 5.6 mm]. Showery rain moderate to heavy at times after midnight on the 7th, but a bright morning with 5 oktas mostly cumulus cloud cover at 0900 GMT. Still mild at 11.8C with a blustery wind S'ly veering W'ly as a frontal system passed over from 11 GMT. Pressure was on 985 mb with low 958 mb S Greenland and frontal system North Channel to Cardigan Bay and cold front over Ireland. The temperature rose to 12.6C around noon then began to fall reaching a minimum of 8.4C around 18 GMT before starting to rise again. I saw 5 curlew on a permanent pasture field in lower Black Horse lane, flying off with their familiar call. I used to see a lot more in this area, they have become rarer in recent years. Showery rain from 15 GMT (Myerscough 15.1C Hawarden 13.6C Odiham 3.3C Ballypatrick For. 40.0 mm Scolton CP. 38.0 mm Exeter 1.8h Hawarden 0.9h) [Max 12.6C Min 10.9C Rain 4.8 mm]. Autumn colours inside and out.Pressure 1008 mb was rising on the morning of the 8th, there was a patch of blue to the NE at 0900 GMT, but that was it. Showers in the night and there was a bank of cloud building to the S of the Snowdonia Mountains. Low 973 mb was W of Ireland while pressure was high 1029 mb Russia and 1025 mb N Africa. Showery rain here in the afternoon with the temperature rising during the evening. Very wet mid and S Wales (Kew Gardens 14.9C Mumbles Hd. 13.4C Altnaharra -2.3C Scolton CP. 45.6 mm Manston 7.9h Hawarden 0.1h) [Max 12.5C Min 5.4C Rain 6.2 mm]. A mild night with the temperature in excess of 12C and 12.3C at 0900 GMT on the morning of the 9th when fine and bright although there was a blustery SE Föhn wind of the Snowdonia Mountains with relative humidity on 66%, the tmperature rose to 12.7C later on. A not too bad a day here, there was heavy rain with a Met Office amber warning in force for Pembrokeshire and Milford Haven where some homes were reported flooded with 10 ft of water from an overflowing lake. Showers here moderate to heavy at 1745 GMT (Kew Gardens 14.5C Santon Downham 0.6C Logan Botanic Garden 43.2 mm Tredegar 28.8 mm Weybourne 5.4h Valley 0.0h) [Max 12.7C Min 8.4C Rain 8.2 mm].

There were showers of rain overnight, but the morning of the 10th was fine and bright, but visibiliy was moderate to poor. A cooler morning with 9.0C at 0900 GMT. Pressure 988.5 mb was rising with a low 962 mb between S of iceland and NW Scotland. There were numerous showery troughs around and the day turned out very showery, it was a good afternoon to watch rugby on TV Wales beating Australia 9-6 at Cardiff, with the stadium roof closed, for the first time in 10-years. The AWS recorded 16 showers and clocked up 16.6 mm through the 24-h 09-09z (Kew 15.8C Pembrey sands 13.2C Topcliff 2.9C Goudhurst 40.6 mm Capel Curig 21.4 mm Magilligan 6.4h) [Max 12.7C Min 6.9C rain 16.6 mm]...

Evening sky after a fine sunny day.The 15th turned out a very fine day with warm sunshine. Pressure was steady on 1016 mb with a high 1032 mb E Europe keeping at bay low 966 mb between Iceland and Scotland and a small low 990 mb just W of Ireland. This gave us a SE'ly flow and Föhn-like conditions here and in Llanfairfechan. The maximum temperature here was 16.7C with relative humidity of 57%, while at Gorwel Heights the maximum reached 18.2C, one of the highest in the UK today. The record highest in November here is 17.7C on 3rd in 2011, while today's temperature was recorded later in the month on the 28th in 2000. The Kinlochewe temperature 17.6C is claimed to be the highest latest in the year (Kinlochewe 17.6C Föhn Trawsgoed 17.3C Shobdon 0.1C Achnagart 20.2 mm Aberporth 7.2h) [Max 16.7C Min 8.5C Pptn trace dew] .

The first 15-days had 86.2 mm of rainfall (61%) & [68%] of the monthly average. Temperature were well above average with the mean temperature 10.0C was (+1.1) and [+2.3] of the averages for the month.

Cloudless skies with warm hazy sunshine in November.Another fine day on the 16th with wall to wall hazy sunshine over SE Anglesey and N Snowdonia Mountains. Pressure here 1023 mb was rising with high 1047 to the E blocking advance of complex low pressure 950 mb over the Atlantic S of Greenland and Iceland to the W This was drawing in air from the S and this was holding some Saharan dust help to produce the haze. The temperature rose to 15.5C after noon and the sunshine held all day. After dark as the temperature reduced heavy dew formed on the grass, but there was no frost (Edinburgh Botanic Garden 15.5C Aboyne -1.5C Threave 2.8 mm Altnaharra 5.6h Valley 2.4h) [Max 15.5C Min 7.5C Grass 3.2C Pptn trace dew]. End of a glorious autumn day.For the third morning the sky was almost cloudless on the morning of the 17th with hazy sunshine. A moderate to heavy dewfall overnight 0.3 mm was measured by the dew pad, but the standard copper gauge bottle was dry though there was condensation on the funnel warranting a trace record. Soil moisture determined today was 48% dry mass; grass had grown over the past 28 days at a rate of 1.8 g dry mass m -2 d -1 with the total annual yield 924 g dry mass m -2 (924 tonnes per hectare) second lowest of the past 15-years. Pressure 1025 mb was rising with high 1044 mb E of the Baltic while complex low 976 mb over the Atlantic is kept at bay, A sunny day. RAF Valley was the sunniest and warmest in the UK reporting 7.9h, a glorious sunset at the end of the day (Valley 14.3C Braemar -2.0C Ballypatrick F. 2.2 mm Valley 7.9h) [Max 13.1C Min 7.5C Grass 3.2C Pptn trace]. A clear night with bright stars, a little cooler with dew formation (0.2 mm recorded), but no frost the grass minimum thermometer reading 1.4C. A fine sunny morning on the 18th with a little cloud to the S, this diminishing to give mostly blue skies again. Air temperature 6.0C (dewpoint 3.4C) and pressure rising slowly with high 1046 mb near Kemi at the head of the Gulf of Bothnia. Lows being kept in the wings 983 mb SE Greenland and 974 mb Atlantic S of Greenland. There was a low 1004 mb over the eastern Med. A little patchy cloud here at first, clear skies NW Anglesey at South Stack, a cooler day (St, Bees Hd. 15.5C Porthmadog 14.8C Braemar -5.6C Lake Vyrnwy 0.8 mm E. Malling 8.2h) [Max 10.3 Min 5.3 Grass 1.4C Rain nil]. Fine and dry overnight with an E'ly breeze, on the morning of the 19th there was virtually no dew formation (0.02 mm). Bright, but a cold E'ly breeze making the 7.1C air temperature felt a lot colder. Cloud formations over the mountaintops the sun appearing about 10 o'clock. Pressure was steady on 1035 mb with high 1042 mb S Norway and Atlantic-low 977 mb S of Greenland. Low 998 mb was over the western Med. Another sunny morning and afternoon (Crosby 10.5C Pembrey Sands 10.2C Aviemore -6.4C Manston 5.4 mm Stornoway 6.4h Valley 5.8h) [Max 8.9C Min 5.5C Rain 0.4 mm].

A mostly cloudy morning on the 20th with wintry showers, wet small snow pellets and a rainbow at 0900 GMT, a further shower of rain at 18 GMT (Islay 9.0C Kinloss -0.2C Hull 17.2 mm Bala 6.4 mm Tiree 6.4h) [Max 7.1C Min 5.2C Grass 3.3C Rain 3.5 mm] . Falling maxima temperatures in the last week.Frequent showers of rain after midnight and still some cloud around at first on the 21st and with an ESE'ly breeze there were lenticular clouds in the less of the mountains for a while. Visibility was moderate and had lessened in the last hour. The temperature was 3.7C and pressure on 1008 mb. Cloud persisted on mountaintops in the afternoon, but it was mostly clear and sunny on Anglesey. Over the last week maximum air temperatures have been falling steadily (left) (Scilly 10.1C Milford Haven 8.2C Exeter -3.2C Kielder Castle 25.4C Camborne 5.0h) [Max 5.9C Min 2.9C Grass 1.7C Rain nil]. Snow on Carnedd Llewelyn in hazy November sunshine.A really nice day though frosty at first on the 22nd with a cool feeling N'ly breeze. Pressure was steady on 1018 mb with a low 1002 mb Biscay and Celtic Sea with the persistent high 1032 S Norway. Snow persisting on the mountains with the Carneddau summits looking white in the afternoon hazy sunshine. Anglesey warmest and sunniest in Wales with Valley reporting 7.0h sunshine and with Llansadwrn 7.8C (Scilly 10.9C S Newington -6.7C Craibstone 14.0 mm Valley 7.0h) [Max 7.8C Min 1.0C Grass -2.5C Rain nil Dew/Frost 0.24 mm]. After some clear sky and frost overnight the morning of the 23rd was becoming cloudier before 0900 GMT. There had been a ground frost with the grass moderately white and the soil surface and exposed water frozen. The air temperature was rising from a minimum of 0.7C to 3.5C and there were 5 oktas of increasing cloud cover and soon there were showers of rain. Air temperature at Mona had been -2.3C the lowest reported in the UK last night. Visibility was poor with haze but did improve during the day. Pressure was on 1014 mb with a low 1004 mb over the Celtic Sea. Towards evening the sky brightened and the sun was seen at sunset (Bude 13.2C Mona -2.3C North Wyke 28.8 mm Milford Haven 4.2 mm Manston 4.4h) [Max 7.0C Min 0.7C Grass -3.2C Rain 1.6 mm].

Looking across the Menai Strait at Beaumaris on a grey day.

The sky had turned mostly cloudy by dawn on the 24th, but it had started to disperse by 0900 GMT. Visibility was poor in haze and there was not much improvement through the day with mountains obscured. Pressure 1014 mb was rising with low 1002 mb off Lands End with an occluded front over the Channel. Pressure was high 1033 mb Greenland and Iceland region. The cloud mostly cleared during the morning that was then sunny with a maximum of 8.1C. Hazy sunshine in the afternoon in the lee of the mountains with light E'ly breeze (Scilly 11.4C Porthmadog 9.5C Bridgefoot -2.2C Isle of Portland 38.2 mm Tiree 5.7 Valley 1.0h) [Max 8.1C Min 2.6C Grass 0.0C Rain nil Dew 0.26 mm]. A fine and sunny morning on the 25th the haze had cleared and visibility was good with a little mist at lower levels. Frost-free overnight the air minimum 3.2C and 1.0C on the grass. Pressure was steady on 1014 mb with a low 999 mb over the Charente Maritime, France. Mostly sunny then turned cloudier later; again it kept dry (Scilly 10.0C Porthmadog 9.5C Resallach -3.9C High Mowthorpe 13.2 mm Valley 5.9h) [Max 8.0C Min 3.2C Grass 1.0C Rain nil].

Across fields favoured by curlew and lapwings a view of Snowdonia with mackerel sky.

Clear sky at times overnight, and around 06 GMT, but it was mostly cloudy by 0900 GMT on the 26th after a touch of ground frost -0.5C with an air minimum of 2.6C then risen to 5.0C. Pressure was 1016 mb in a lingering ridge from Arctic-high 1030 mb in the region of Iceland and Greenland. Over the Atlantic to the W low 973 mb with frontal systems approaching Ireland. The Med was unsettled with low 999 mb over the Adriatic. Clear views of the mountains in the afternoon with a little snow and ice capping Snowdon and the highest Carneddau summits. A flock of 50 curlews with a few lapwings were seen on fields near Blackhorse Lane in the afternoon (Scilly 11.6C Usk 9.6C Shap -5.3C Morpeth 10.0 mm Dundrennan 6.5h) [Max 8.1C Min 2.6C Grass -0.5C Rain nil].

There was a red sky over the Carneddau Mountains around 8 GMT on the 27th on the fine mostly cloudy morning. Overnight there had been a ground frost of -3.4C with an air minimum of 1.0C. At 0900 GMT there was a moderate SE'ly breeze and a temperature of 7.4C (dewpoint 0.9C RH 63%). With the wind strengthening there was showery rain in the afternoon with some sunny spells. More curlews and lapwings were seen on fields alongside Blackhorse Lane (Bude 12.5C Milford haven 11.6C Aviemore -5.1C Scolton 31.8 nn Morpeth 4.0 h Aberporth 1.2h) [Max 13.6C Min 5.6C Grass 1.5C rain 4.0 mm] After a fairly quiet night the morning of the 28th had become breezy with the approach of Portuguese-named storm Diana. Pressure 994 mb was falling rapidly with the low 964 mb just W of Shannon, Ireland at 06 GMT having closely packed isobars to the SW. The Met Office had issued yellow warnings of wind and by noon with showers of rain there were high gusts reported by the Llanfairfechan AWS's Gorddinog 56 mph and Gorwel Heights 63 mph. A 30 mph speed restriction was on the Britannia Bridge and closed to high-sided vehicles, but there were many running the gauntlet; Police tweeted that over 100 were counted in the first hour of the ban taking place. Capel Curig reported a peak gust of 89 mph; Valley & Mona 69 mph; Rhyl 61 mph. A blustery day with showers at times, somewhat sheltered wind (gust 45 mph) and rain by the mountains. Pressure rose in the evening reaching 998.8 mb at 2310 GMT (Rhyl 15.8C Föhn Bala 1.8C Keswick 47.4 mm Whitechurch 21.6 mm Aviemore 1.8h Hawarden 0.4h) [Max 14.6C Min 5.6C Rain 8.2 mm].

It was business as usual on the 29th with pressure dropping rapidly as a small frontal-wave low steamed through St. George's Channel to Anglesey arriving at 0900 GMT. The strong SW'ly wind had fallen light then backed around the compass from just before 03 GMT to 06 GMT before strengthening again. After midnight the temperature first fell slowly to 9.3C at 0440 GMT then began to rise rapidly in warm air to 13.9C at 0820 GMT; at 0900 GMT it was 13.4C. There was moderate to heavy rain from 0330 GMT. Strong to gale-force SW'ly wind at 0900 GMT, it was pretty rough outside, poor visibility in near horizontal rain. High gusts recorded again in Llanfairfechan 62 mph at Gorwel Heights and 57 mph at Gorddinog; Capel Curig 67 mph; Valley 60 mph; and 40 mph here. At 0930 GMT the wind moderated quickly again as the temperature fell on a cold front. At 1120 GMT the temperature reached a low of 7.7C (a range of 6.2C). Showery rain continued including ice pellets at 1447 GMT and 1712 GMT when thunder was heard. The evening was drier with the sky clearing a little from time to time (Leeming 14.8C Rhyl 13.9C Killylane 4.8C Libanus 43.0 mm Bude 2.5h) [Max 13.5C Min 8.6C Pptn 14.0 mm]. A breezy morning on the 30th with a mostly cloud covered sky. Pressure 1002 mb was rising quickly with low 959 mb mid-way between Scotland and Iceland with pressure high 1048 mb over Russia where it is very cold. A little weak sunshine at first, it was fine and sunny over most of the Midlands, towering cumulus clouds were developing over the Snowdonia Mountains in the morning. A few glimpses of sunshine in the afternoon with some 'spits and spots' of rain at times (Frittenden 12.7C Altnahinch 2.9C Achnagart 52.6 mm Tredegar 10.8 mm Wellesbourne 6.5h) [Max 9.0C Min 6.4C Grass 3.3C Rain 1.4 mm].

The month ended with a rainfall total of 119.3 mm (85%) &[95%] of averages, least since 2016. A mild month the mean temperature 8.7C highest since 2015 was near the decadal average (-0.2), but above [+1.0] the 30-y climatological average. A fairly sunny month with 119.3h recorded at RAF Valley.

December 2018

December 1 - A dull and damp morning, lowish cloud, mist and rain. Pressure 996 mb was falling quickly with low 993 mb S Ireland. There was a SSE'ly breeze and there was a modest lee effect, with the sun breaking through at 0920 GMT for a while before disappearing again for the rest of the day. Showery rain in the evening, heavy at 2145 GMT (Exeter 15.2C Rhyl 13.2C Kielder Castle -0.4C Liscombe 19.0 mm Scolton CP 15.8 mm Tiree 2.6h Valley nil) [Max 12.0C Min 8.5C Grass 8.0C Rain 8.4 mm]. Another dull morning on the 2nd with intermittent slight rain in poor misty visibility, the RH was 99% and a force 4 SW'ly. A bit drier at first in the afternoon, but came on to blow with rain about 1430 GMT (Kew gardens 15.9C Rhyl 14.8C Lossiemouth -3.7C Threave & Capel Curig 20.8 mm Lerwick 2.9h Valley 2.0h) [Max 12.5C Min 8.5C Rain 16.3 mm]. Third morning in a row on the 3rd to be overcast, dull and it was raining. There had been heavy rain in the night 0318 GMT 13 mm/h when 2.2 mm fell in an hour. Water was beginning to pool on the ground and roadsides were awash, a sign the soils are near saturation. Entrances to fields where soil structure is poor now all have standing water on them. At 06 GMT frontal-wave low 992 mb was over St. George's Channel and pressure 995 mb here was rising quickly at 09 GMT. There was a train of depressions on the Atlantic jetstream, one 991 mb over the Azores, heading our way. Pressure was high 1028 mb Spain, 1018 mb Greenland and 1028 mb Russia. The afternoon cleared up fine with some sunshine, cooler (Otterbourne 14.6C Katesbridge -1.1C Sennybridge 31.0 mm Charterhall 6.0h) [Max 8.9C Min 7.5C Rain 0.6 mm]. A change the morning of the 4th, it was very fine and sunny in a lee effect with a smoke drifting SSE'ly breeze. Some clear spells overnight in this part of the island had resulted in rapidly falling temperature that had frozen rain on the grass covering the minimum thermometer -1.7C. Similar icy conditions had occurred on the NE Snowdonia Mountains. Pressure 1021 mb was rising (Scilly Is. 12.6C Valley 8.4C Redesdale -6.2C Whitechurch Pembs. 8.8 mm Kinloss 4.7h) [Max 6.2C Min 2.3C Grass -1.7C Rain 8.8 mm].

Rainfall accumulated 24-h up to 09 GMT on 7 December 2018. SYNOP & local PWS sources. It was raining on the morning of the 5th under grey skies. Pressure 1009 mb was falling with a low 1002 mb over he Atlantic to the SW while pressure remained high 1031 mb over Europe and 1017 mb Greenland/ Iceland region. A mild 9.9C tempersture at 09 GMT and a light S'ly breeze. A wet a sunless day, especially in Snowdonia where Capel Curig had [50.6 mm]. It was cold in Scotland, Braemar minimum -8.8C (Odiham 13.9C Braemar -8.8C Whitechurch 30.3 mm Altnaharra 3.5h) [Max 12.1C Min 2.9C Rain 6.0 mm]. No better on the 6th that again had overcast skies and remained sunless. What can one say? It is wintertime (Hawarden 14.1C Aviemore -4.1C Capel Curig 16.0 mm Aberdeen 1.9h) [Capel Curig 50.6 mm] [Max 12.0C Min 9.0C Rain 24.0 mm.



The first 15-days had 86.8 mm mm of rainfall (57%) & [72%] of the monthly average. Temperatures were generally on the warmer side with the mean 7.5C [+2.2] of the 30-year climatological average.

Some unusual flaming red sky colours with lee-wave clouds on 13 Dec 2018.


After dawn on the 13th a red sky began to develop over the Snowdonia Mountains at 0750 GMT. The colour was unusual and by 8.20 a.m. when the photograph was taken could be described as flaming, but within a few minutes it had subsided. An unusual colour was seen at other locations across N Wales (Duncan Brown, pers comm). The colouration resembled in some respects the colours seen during the red sun event of 16 October 2017 (Diary) caused by the scattering of light by a mixture of Portuguese wildfire smoke and Saharan dust. Dust forecast models (SKIRON) by the University of Athens had predicted a localised finger of dust over western Britain. Also here was some dry air around for at 0900 GMT the temperature was 5.2C (dewpoint -3.0C) and a relative humidity of 55% in Llansadwrn where the breeze was SE'ly off the mountains. It was noted that there had been a slight deposit of a grey coloured dust and in combination with European smoke might have caused the light scattering effect on this occasion. (Scilly 9.5C Milford haven 7.6C Charlewood -2.5C Scilly 11.4 mm E. Malling 7.0h) [Max 5.6C Min 4.7C].

Some clear sky overnight had allowed a touch of frost to appear on the grass (-0.5C) on the morning of the 17th when it was fine and bright. A little snow could be seen on the highest Snowdonia summits with backlit cumuli above. Soon turning cloudier the temperature 5.4C at 0900 GMT was to rise with the approach of warm sector tropical air from the region of the Azores during the day and into the night reaching 11.5C by 2100 GMT (Bude 12.4C Gogerddan 11.7C Aboyne -3.6C Tyndrum 12.2 mm E Malling 6.9h) [Max 12.4C Min 5.2C Grass -0.5C Rain 2.4 mm]. Strong gale-force winds affected Anglesey and N Wales on the morning of the 18th with 61 mph recorded at Capel Curig and Gorwel Heights, and 56 mph at Gorddinog, Llanfairfechan, with 63 mph at RAF Valley. Power cuts were reported due to cables down in parts of Anglesey. It had been a mild night with the temperature rising on a warm front to 12.4C at 04 GMT in Llansadwrn. Pressure had fallen to 997 mb at 0900 GMT when the temperature was 10.4C. The morning was very blustery, I had a job to stand at my Stevenson Screen taking the obs and hold on to my hat with a terrific roaring in the trees hereabouts, but the wind had moderated by noon he slight rain continuing with poor to moderate visibility. A sunless day (Aultbea 12.7C Cranwell 1.3C Cluanie Inn 65.4 Tredegar 40.2 mm Tiree 0.6h) [Max 10.5C Min 5.2C Pptn 10.6 mm]. Showers in the night some with wet snow pellets, but before 09 GMT on the 19th the sky was clearing and a little snow could be seen on the high summits of Carnedd Dafydd and C. Llewelyn. The temperature was 5.9C (dewpoint 3.0C) and at first the morning was bright with some sunshine. Soon convective clouds developed with towering cumuli and the odd cumulonimbus was spotted. Gathering dark clouds after noon with a heavy shower of rain and ice pellets at 1226 GMT that fell at a rate up to 56 mm/h. It did not clear up again after that with successive lines of showers moving in off the Irish Sea into the evening (Mt. Batten 10.7C Tain range -3.0C Capel Curig 38.4 mm Lyneham 5.2h) [Max 8.9C Min 5.2C Rain 13.0 mm].


The 20th began fine and fairly dull with the sky mostly cloudy, but it brightened soon after 0900 GMT. Soil moisture content of surface soil under grass and on the bare met plot.Pressure 1002 mb was rising with a low 986 mb off the western isles with frontal cloud over the north of Britain with shower trough were in the west. Yield of grass (net primary production 2004-2018) over the year.Mild at 7.1C, a few cumulus clouds developed, but the afternoon was fairly sunny and dry. Soil moisture determined today was 50.9% dry mass well off saturation point. Grass was looking green the fine grasses are still growing, but the standing biomass had reduced due to decomposition of dead leaf material. Overall the yield this year has been the second lowest since 2004 over a 15-y period, 2013 had the least yield and 2004 the most (Scilly 11.9C Tain range -3.4C Pately Bridge 22.2 mm Cardiff 21.0 mm Shoeburyness 4.8h) [Max 8.9C Min 5.3C Rain 4.9 mm].

A misty moisty morning on the 21st, dull and damp with moderate visibility. A mild 6.7C at 0900 GMT with pressure 995 mb rising quickly after a low of 991 mb at 06 GMT. The low was over Wales and pressure was high 1034 mb over Spain. The day remained dull with drizzle and slight rain at times (St. James Park 13.1C Altnaharra -3.3C Gogerddan 26.0 mm Bournemouth 3.3h) [Max 9.8C Min 6.2C rain 7.2 mm]. Early on the 22nd at 0413 GMT there was a heavy shower of rain and ice pellets that fell at a rate up to 62 mm/h. The morning was still showery and dull, but brightened later for a while with glimpses of sunshine. Pressure 1012 mb was rising with a ridge of high pressure advancing from the west with high 1034 mb Iberia. There was a low 999 mb off the N of Scotland. It was sunny the the south-east (Swanage 12.2C Mumbles head 11.6C Fyvie Castle -3.6C Cluanie Inn 24.0 mm Shoeburyness 5.8h) [Max 9.7C Min 6.7C Rain 8.2 mm]. A heavy shower had fallen at 0131 GMT on the 23rd and the morning began with overcast skies and poor misty visibility. Pressure was on 1013 mb with a low near Anglesey while pressure remained high 1033 mb over Spain. A 'grey day' with little brightness the total solar radiation recorded being 0.71 MJ m -2, third dullest of the month, and no sunshine (Exeter 13.9C Aboyne -2.6C Okehampton 25.2 mm Porthmadog 14.4 mm Tiree 2.7h) [Max 6.9C Min 3.0C Rain 1.8 mm]. The 24th began with some brightness, but cool with almost a ground frost the thermometer reading 0.3C. There was high pressure over the UK and was 1031 mb here. Mist and fog had developed over much of England and the Welsh borders. Very fine, bright and calm, one of those morning when sounds carries a long way and train horns on the line to Bangor could be heard; unusually the birds were quiet.

Dates of first flowering snowdrop  in the garden in Llansadwrn winters 1996-2019. The first snowdrops of the winter/ spring 2019 to open in the garden.For the second time this year the first appearance of a snowdrop was recorded in the garden, the second earliest on record (graphic left). The date is recorded when a flower is fully developed (right), low green shoots with white tips have been seen for a week or two and don't count. The first appearance for the 2018 winter/ spring was on 5 January and here we are on the 24th December with the first 2019 winter/ spring record. This is quite rare, over the 24-years of recording it has occurred just once before in 1998 on 1 January and 31st December. Flowering 12 days earlier than last winter which was one day before the median date on 6 January.

There was a little sunshine and the day kept dry (Scilly 12.2C Valley 9.8C Tyndrum -6.0C Camborne 8.4 mm Morecambe 5.9h Hawarden 3.6h) [Max 9.6C Min 3.8C Rain nil]. The 25th Christmas Day was cloudy, a little warmer and sunless (Achnagart 13.6C Gogerddan 11.7C Aboyne -8.4C Tredegar 2.0 mm Tibenham 4,7g) [Max 11.1C Min 4.3C Pptn 0.2 mm]. The 26th began overcast with mist and fog in places especially in coastal areas. The cloud was thin enough locally for a little weak sunshine at first (Tain Range 12.9C Rhyl 11.5C Fyvie Castle -1.8C Achnagart 21.2 mm Leeming 1.8h) [Max 10.5C Min 9.3C Rain nil]. There was little change on he 27th with skies remaining cloudy and dull. Pressure 1027 mb was still influenced by high 1035 mb over Europe. The day was dry before a little rain fell overnight (Killowen 12.7C Frittenden -0.8C Kinlochewe 2.8 mm Porthmadog 1.2 mm Camborne 6.1h) [Max 10.0C Min 8.2C Rain 0.6 mm].

Pressure had fallen to 1027 mb around midnight on the 28th, but at 0900 GMT was rising quickly on 1029 mb. Pressure was high 1035 mb over Iberia and low 981 mb over the Denmark Strait this having a frontal system lying over the Western isles and Irish Sea. Weather was brightest in central England and N Scotland. Here rain was in sight and arrived here at 0915 GMT. The morning had slight rain and drizzle, the afternoon was a little drier, but still had fine drizzle most of the time. Mild (Hawarden 12.8C Goudhurst -1.8C Achnagart 17.4 mm Sennybridge 1.6 mm Boulmer 4.5h) [Max 10.6C Min 7.8C Rain 2.8 mm]. Mild overnight around 10C most of the time and on the 29th at 0900 GMT it was still 10.0C with 100% relative humidity. It was misty with poor visibility and with a very fine drizzle. Pressure was on 1030 mb with a high 1037 mb over Biscay. A low 1008 mb was over NW Scotland moving towards the North Sea. The afternoon turned out better with the sky clearing and there was some sunshine (Usk 14.1C Aboyne 0.2C Cluanie Inn 26.0 mm Capel Curig 7.4 mm Edinburgh 4.3h Valley 3.2h) [Max 11.0C Min 8.9C Rain 0.3 mm]. The best thing about the 30th was that I heard a mistle thrush singing at 0900 GMT while making the observations. Another dull and sunless day with drizzle on and off all day, not amounting to much volume, but making it unpleasant. And yet pressure 1035 mb was rising with a high now over central France 1037 mb. There was a warm front along the spine of the UK the mild air transported from the Mediterranean region. Topcliffe had a temperature range of 12.5C (Topcliffe 13.3C Hawarden 12.5C Topcliffe Min -0.8C Achnagart 14.6C Morpeth 2.3h) [Max 10.8C Min 6.5C Rain 0.2 mm]. The last day of the year the 31st was no different with skies overcast and no sunshine. Pressure 1036 mb was still rising with a high 1039 mb over Lands End (Aboyne 13.5C Topcliffe 1.8C Cluanie Inn 26.0 mm Aberdeen 2.6h Valley nil) [Max 9.6C Min 8.1C Rain 0.2 mm].

The month ended with a rainfall total of 147.2 mm (96%) &[122%] of averages, largest since 2015. A very mild month the mean temperature 7.8C although just 0.1C lower than 2017 was (+1.9) and [+2.4] of averages. It was a very dull month the 19.8h of sunshine recorded at RAF Valley was lowest since 1931 on the Anglesey record (Campbell-Stokes corrected values).





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