Davis Vantage Vue AWS at Gorwel Heights in Llanfairfechan.

Llansadwrn (Anglesey) Weather:
Monthly and Annual
Summary for 2017

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn




January 2017

Another 'dry' winter month with temperatures generally above average

Alternating spells of colder and warmer weather

Rainfall of 48.0 mm (42%) & [47%] of averages, was least since 1997, ranking 11th in records back to 1928. The wettest day in terms of volume was on the 8th with just 9.2 mm. This fell over 5 hours duration, but on the 6th there were 14 h when it rained and only 7.2 mm was collected. Another damp day was on the 14th when 6.2 mm fell over 10 h duration. Four days had no precipitation what so ever. (-0.8) of average. Dry days that allow for <0.2 mm of rain, and may include other precipitation including dew, were 12 (+3.3) of average. Rain days(>=0.2 mm) numbered 19 (-3.3); wet days (>=1.0 mm) were 12 (-6.1); and days having 5 mm, or more, were 4 (-4.4). All categories were below average except dry days. At Gorwel Heights it was a little drier with 38.6 mm falling [34%] of average. Dry days were 10; rain days 21; wet days 10; and only 2 had 5 mm, or more.

Temperatures were above average for most of the month. The mean 5.7C was lowest since 2015, but was (+0.4) & [+0.6] of averages and ranked 13th warmest of the last 38-years. The highest maximum on the 30th was 12.7C (+0.2) & [+0.5] and the lowest 3.7C on the 12th was (+0.7). The lowest minima were in air 3.3C (+0.5) & [+0.7] on the 12th and on the grass -6.5C (-0.2) was recorded on the 5th and 26th. Earth temperatures were at 30 cm 6.1C (+0.7) and 100 cm 7.7C (+0.5). At Gorwel Heights the mean temperature was 6.8C [+0.5]; the highest maximum 15.1C on the 31st and lowest minimum 0.6C on the 22nd.

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February 2017

Fairly mild, windy and dull - temperatures and rainfall above averages

Wettest at the end of the month

A mild month generally with the mean temperature 6.5C (+0.9) & [+1.2] of averages, highest since 2011, ranking 7th highest in station records. The mean minimum showing the greatest anomalies was 4.1C (+1.5) & [+1.9] of averages, again highest since 2011 and ranking 4th. The highest minimum was 8.3C on the 18th while the lowest -0.3C and the only air frost was for only 2 hours duration. The mean maximum showing the smallest anomaly was 8.9C (+0.4) & [+0.6] of averages with the highest 14.3C on the 2nd and lowest 4.2C on the 10th. There were 12 ground frosts (-3.7) the lowest recorded was -5.6C on the 9th. At Gorwel Heights the mean temperature was 7.3C [+1.4]. The highest maximum was 14.7C on the 18th; the lowest 3.8C on the 10th. The mean minimum was 4.8C with the highest 9.1C on the 21st and lowest 0.7C on the 10th with no air frosts recorded.

Although rainfall was above average the total was modest for February totalling just under the 100 mm mark with 97.8 mm. This was (138%) & [124%] of averages and was lowest since 2015 and ranked 26th largest since 1928. The wettest day was on the 22nd with 19 wet hours and 18.0 mm rainfall. Another 17.0 mm fell on the 25th this having 15 wet hours. There were 3 (-2.6) days with no precipitation and 8 (-2.7) days were recorded as dry. Rain days were 20 and these were (+2.4) of average and wet days 14 (+2.2). Days with 5 mm, or more totalled 8 and were (=3.5) of average. Wet hours totalled 142 and the average rainfall per wet hour was 0.7 mm. At Gorwel Heights rainfall was 84.0 mm [108%] of average. The wettest day was on the 3rd with 14.2 mm and wet hours were 125 with an average fall of 0.7 mm per wet hour.

It was a dull month with only 49.2 h of sunshine recorded at RAF Valley, dullest since 2012 and ranked the 7th lowest on the Anglesey record since 1931.

Winter 2016/17

Last winter was the warmest and wettest on record in Llansadwrn. No records broken this winter, but it was the 3rd warmest on record the mean 6.7C (+1.1) & [+1.4] of averages while rainfall of 234.6 mm, lowest since 2010, ranked 19th lowest since 1928 and was (73%) & [78%] of averages.

There were 9 air frosts, lowest since 2013/14, ranking 10th in records since 1979/80.

There were 39 ground frosts, lowest since 2007, ranking 11th in records since 1985/86

Sunshine recorded at RAF Valley was 139.3 hours lowest since 2012, 8th lowest since 1931.

Winter seasonal averages Anomalies
10-y 30-y
Temperature (C)
Mean maximum 9.1 +0.9 +1.2
Mean minimum 4.3 +1.4 +1.7
Mean 6.7 +1.1 +1.4
Rainfall (mm) 234.6 73% 78 %

 

 

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March 2017

Wet and warm, but rather dull

Wettest since 2006; warmest since 2012; sunshine lowest since 2006. Brief cool spell 21 - 22nd.

With predominately 19 days with S-SW'ly winds rainfall totalled 135.6 mm and this was the largest in March since 2006 ranking 8th in Llansadwrn since 1928: 213% above the decadal average and 159 % above the 3-y average. The number of Marches with more that 100 mm is now 16, the second driest month of the year second only to April with 8 years. The wettest day was on the 30th with 19.2 mm, but the first had 17.2 mm and the 5th 13.6 mm. There were 13 days that had 5 mm or more 8.9d above average. Wet days were 9.0d above average with 20 days. There were, however, 5 days (- 4.2) with no precipitation ; 8 dry days (-7.8); 23 rain days (+7.8); and 20 wet days (+9.0). On four morning there was standing water other wise the soil was moist every day. At Gorwel Heights rainfall was 114.4 mm [132%] of average and the wettest day here was 15.4 mm on the 6th. Dry days were 10; raindays 21; wet days 18; and days with 5 mm, or more, were 10. Wet hour duration was 143 with an average of 0.8 mm per hour. In Llansadwrn wet hours were 165 with an average of 0.8 mm per hour.

A generally warm month with highest than average temperatures. The mean in Llansadwrn was 8.3C (+1.6) & [+1.3] of averages, highest since 2012 ranking 3rd since 1979. The mean maximum was 11.4C with the highest 17.4C (+1.4) on the 27th and the lowest 5.2C (-0.1) on the 5th. The mean minimum was 5.2C (+1.8) & [+1.6] again ranking 3rd. There was no air frost and there were 8 (-6.0) days with ground frost the lowest -3.8C on the 1st of the month. The mean temperature at Gorwel Heights was 9.1C [+1.7] with the highest maximum 16.5C on the 30th and the lowest 6.4C on the 5th. The mean minimum was 6.2C with the highest minimum 12.4C on the 30th and the lowest 1.6C on the 1st.

There were some very dull days with 8 of them sunless. The lowest solar radiation recorded was 1.64 MJ m -2 on the 11th while the highest was 14.97 MJ m -2 on the 25th. Sunshine at RAF Valley was 109.6h, lowest since 2006 ranking 32 on the Anglesey record since 1931. The sunniest days were on the 24th with 11.1h and the 25th 11.0h

 

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Monthly data 2017

Llansadwrn (Anglesey): Monthly weather data summary for 2017
Anomaly ~ is based on the 2007-16 average.
Anomaly 30-y is based on the 1981-2010 average.
.
.
Air temperatures (C) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
.
Mean max 8.1 8.9 11.4 9.5
Mean min 3.3 4.1 5.2 4.2
Mean 5.7 6.5 8.3 6.8
Anomaly~ 0.4 0.9 1.6 0.2
Anomaly 30-y 0.6 1.2 1.3 0.4
High max 12.7 14.3 17.4 17.4
Date 30 2 27 .
Low max 3.7 4.2 5.2 3.7
Date 12 10 5 .
High min 8.0 8.3 10.3 10.3
Date 8 18 30 .
Low min -1.4 -0.3 1.0 -1.4
Date 5 10 1 .
Grass min -6.5 -5.6 -3.8 -6.5
Date 5, 26 9 1 .
.
MSL Pressure at 09 GMT (mb) 1022 1011 1013 1015
Highest 1039 1030 1034 1039
Date 19 11 25 .
Lowest 999.7 978.8 982.6 979
Date 12 2 4 .
.
Means at 0900 GMT .
Air temperature (C) 5.2 5.7 7.9 6.3
Dew point (C) 3.8 4.3 6.1 4.7
RH% 91 90 89 90
Soil temperatures (C) .
.
5 cm 4.7 5.0 7.2 5.6
10 cm 5.0 5.4 7.3 5.9
20 cm 5.3 5.7 9.3 6.8
30 cm 6.2 6.5 8.2 7.0
Anomaly~ 0.7 0.7 1.1 -4.2
50 cm 6.8 6.9 8.3 7.3
100 cm 7.8 7.5 8.5 7.9
Anomaly~ 0.6 0.7 0.7 -3.6
.
Rainfall (mm) .
.
Rain tot 48.0 97.8 135.6 281.4
Rain % ave~ 42 138 213 24
Rain % 30-y 47 124 159 26
Days 0.0 4 3 5 12
Days <0.2 12 8 8 28
Days >=0.2 19 20 23 62
Days >=1.0 12 14 20 46
Days >=5.0 4 8 13 25
Max fall 9.2 18.0 19.2 19.2
Date 8 22 30 .
Highest rate (mm/h) 24 30 49 49
Date 8 23,28 30 .
Average rain per hour (mm) 0.6 0.7 0.8 0.7
.
Evaporation .
.
Piche (mls/ mm) 24.1 32.3 28.7 85.1
Lysimeter PE (mm) 7.5 14.5 12.8 34.8
AWS ET calculated 10.8 14.8 31.8 57.4
.
Weather (days) .
.
Air frost 4 1 0 5
Ground fr 14 12 8 34
Sl/snow 2 1 2 5
Sn lying 0 0 0 0
Thunder 0 0 1 1
Hail <5 mm 3 6 2 11
Hail >=5 mm 0 0 1 1
Fog at 09h 1 1 0 2
Gales in SE Anglesey 4 0 4
.
Wind direction at 09h (days) .
.
N 0 1 1 2
NE 4 1 3 8
E 0 4 2 6
SE 4 3 3 10
S 5 5 7 17
SW 8 11 12 31
W 3 3 3 9
NW 3 0 0 3
Calm 4 0 0 4
.
Wind speed mph .
.
Daily mean 3.2 6.7 6.3 5.4
Highest daily mean 10.1 15.2 15.0 15.2
Date 1 25 19 .
Mean gust 15.5 23.8 21.6 20.3
Highest gust 31 49 36 49
Date 9 23 17 .
.
AWS records of rainfall and frost .
.
Wet hours (with 0.2 mm,or more) 83 147 165 395
Frost duration (h) 12.3 2 0 14.3
.
Cloud cover at 09h. Mean % 76 80 81 79
.
Global solar radiation (MJ m-2) .
.
Llansadwrn
Sol rad mean 2.58 4.58 7.14 4.77
Maximum 5.97 9.19 14.97 14.97
Date 26 9 25 .
Minimum 0.75 1.01 1.64 0.75
Date 3 25 11 .
Brightest hour W/sq m 302 406 656 656
during hour beginning GMT 12 13 12 12
on day 25 9 25 .
Sunless days 11 11 8 30
.
Sunshine (h) .
.
Valley 49.8 49.2 109.6 208.6
Average %~ 91 62 78 13
Average 30-y 86 61 97 15
Sunniest 7.7 7.9 11.1 11.1
Date 26 8 24 .
Sunless days 10 10 8 28
.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year

Llanfairfechan, Gorwel Heights observations

Gorwel Heights (73 m), Llanfairfechan (Conwy): Monthly weather data summary 2017
# Anomalies based on 1981-2010 MetO Llanfairfechan DataPoint
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Air temperatures (C)
.
Mean max 9.0 9.7 12.0 10.2
Mean min 4.5 4.8 6.2 5.2
Mean 6.8 7.3 9.1 7.7
Anomaly [1981-2010] # 0.5 1.4 1.7 -3.0
.
High max 15.1 14.7 16.5 16.5
Date 31 18 30 .
Low max 4.8 3.8 6.4 3.8
Date 12 9, 10 5 .
High min 9.4 9.1 12.4 12.4
Date 7 21 30 .
Low min 0.6 0.7 1.6 0.6
Date 22 10 1 .
.
MSL Pressure at 09 GMT (mb) 1023 1012 1013 1016
.
Highest 1039 1031 1034 1039
Date 19 11 25 .
Lowest 1000 979 983 979
Date 12 2 4 .
.
Means at 0900 GMT
Air temperature (C) 6.4 6.6 8.9 5.9
Dew point (C) 3.4 4.1 5.9 43.6
RH% 82.0 84 82 83
.
Rainfall (mm)
.
Total 38.6 84.0 114.4 237.0
% [1981-2010] # 34 108 132 22
.
Max fall 6.8 14.2 15.4 15.4
Date 14 3 6 .
Highest rate (mm/h) 23 26 34 34
Date 9 21 6 .
.
Wet hours (with 0.2 mm, or more) 81 125 143 349
Average rain per hour (mm) 0.5 0.7 0.8 0.7
.
Days <0.2 10 9 10 29
Rain >=0.2 21 19 21 61
Wet >=1.0 10 14 18 42
Days >=5.0 2 7 10 19
.
Weather (days) .
.
Air frost 0 0 0 0
Frost duration (h) 0 0 0 0
Wind direction at 09h (days) .
.
N 1 1 4 6
NE 4 1 2 7
E 1 3 0 4
SE 6 7 4 17
S 2 2 2 6
SW 7 11 14 32
W 4 0 1 5
NW 0 1 0 1
Calm 6 2 4 12
.
Mean mph 3.2 6.7 4.2 4.7
Highest daily mean mph 7.4 18.8 8.6 18.8
Date 6 2 17 .
Mean gust 19.4 28.5 22.0 23.3
Highest gust 42 64 35 64
Date 26 2 17 .
.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year

Acknowledgements

The Met Office at RAF Valley kindly supplied observational data from 1942 to 2011. Current data (provisional) are gathered from SYNOP reports and METAR. I am grateful to David Lee for use of data from Gorddinog..



Designed and written by Donald Perkins © 2017

Page first dated 6 February 2017

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