Davis Vantage Vue AWS at Gorwel Heights in Llanfairfechan.

Llansadwrn (Anglesey) Weather:
Monthly and Annual
Summary for 2022

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn




January 2022

Above average temperatures and below average rainfall, sunniest since 2011

Very warm and wet to start then a spell of wintry weather before a fine drier spell ending with a few sunny and warmer days

Rainfall was below average the 62.8 mm (54%) & [61%] of averages least since 2019 was ranked 16th lowest in Llansadwrn records since 1928. The largest fall was 15.8 mm on the 1st and the 21 mm over wet days 6-8th on saturated ground was sufficient to produce local flash flooding on the 8th. There were, however, 8 days (+4.9) with no precipitation with a 6 day spell 20-25th when with cloudy skies it was rather dull. There were 13 (+5.1) dry days (<0.2 mm); 18 (-5.4) rain days (>=0.2 mm); 11 (-6.0) wet days (>=1.0 mm); and 4 days (-3.9) having 5 mm, or more. Drier than usual too at Gorwel Heights, in Llanfairfechan, where 53.6 mm fell (58%) & [60%] of averages least since 2017 (38.6 mm). Here there were 13 dry days; 18 rain days; 15 wet days; and 5 had 5 mm, or more. Rainfall duration (wet hours) at Gorwel Heights was 74h and in Llansadwrn 79h with average rainfall per hour of 0.8 mm and 0.7 mm respectively.

The first of the month was wet, warm and windy. Maximum temperatures were 14.4C at Gorwel Heights and 12.8C Llansadwrn, highest of the month. The mean maximum for the month in Llansadwrn was 8.6C (+0.8) & [+0.7] of averages highest since 2016 ranked 8th in records since 1979. The lowest maximum was 4.2C on the 24th and the mean for the month 4.0C (+0.8) & [+1.1] of averages. The mean temperature 6.3C (+0.8) & [+0.9] of averages highest since 2020 ranked 9th. The highest mean, and the only one in double digits, was 12.2C on the 1st, the lowest 3.5C occurred on the 5th and 24th. At Gorwel Heights the mean temperature was 7.3C (+0.8) & [+1.1] of averages highest since 2020 ranked 3rd in records since 2011. The mean maximum 9.3C highest since 2020 ranked 3rd and the mean minimum 5.2C was equal highest 2020 on record.

Despite 8 sunless days it was sunniest at RAF Valley since 2011 with 67.4h (141%) of the decadal average and [119%] of the climatological average. The sunniest day was on the 14th with 7.0h.

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February 2021

Very mild and fairly sunny with rainfall above historical averages

Mild at the beginning, more wintry with three named storms towards the end

Overall the month was mild with the mean temperature 6.9C (+1.2) & [+1.3] of averages highest since 2019 ranking 5th in station records since 1979. The mean maximum was 9.6C with the highest 12.1C on the 21st and lowest 5.9C on the 18th, the temperature reached 10C, or more, on thirteen days. The mean minimum was 4.2C and showed the greatest anomaly [+1.4], there were no air frosts the lowest 0.8C (+2.4) on the 11th. There were 10 ground frosts (-5.6), lowest since 2011 rank 10, the lowest -4.1C also on the 11th.

At Gorwel Heights in Llanfairfechan the mean air temperature was 8.1C (+1.5) & [+1.9] of averages, highest since 2019 ranking 2 since 2011. The highest maximum was 14.6C on the 16th and there were 19 days that had 10C, or more. The lowest maximum was 5.6C on the 24th. The mean minimum 5.3C lowest since 2019 ranked 4th highest since 2011, with no air frosts recorded the lowest 2.6C on the on the 24th was highest on record at the station.

February rainfall 132.9 mm (123%) & [ 147%] was least since 2019, but one of the 13th largest falls in Llansadwrn records since 1928. The were no very large falls the wettest day on the 8th had 15.8 mm. Only 3 days had no precipitation and 6 (-3.3) were dry <0.2 mm. Rain days were 22 (+2.9); wet days were 16 (+2.7); and days with 5 mm, or more, were 14 significantly (+7.4). Rainfall duration (wet hours) was 148h with an average rate of fall of 0.9 mm per hour.

It was wetter at Gorwel Heights that had 144.4 mm (170%) & [193%] of averages, most since 2020 and second largest on record. The wettest day was on the 5th having 17.4 mm. There were 6 dry days, 22 rain days; 16 wet days; and 11 had 5 mm, or more. Rainfall duration (wet hours) was 129h, with an average rate of fall of 1.1 mm per hour.

Sunshine at RAF Valley was the lowest since 2017, the 76h (91%) & [97%] of averages. Sunniest was the 27th with 8.8h and there were 7 sunless days.

Winter 2021/22

Winter temperature averages were highest since 2019 ranking 3rd in station records since 1979. There were no air frosts in January and February this being a record, with 2 in December 2021 lowest -0.8C. Winter frosts were lowest since 2019/20 when only one lowest on record, this winter then being second lowest on record.

Winter rainfall was drier than the last decade (91%) that has been notable for high rainfall events. Compared with the historical 1971-1980 average it was (139%). When compared with the current 1991-2020 climatological average it was [109%] and with the station's long term average 118%.

Winter seasonal averages Anomalies
10-y 30-y
Temperature (C)
Mean maximum 9.2 +0.7 +1.2
Mean minimum 4.3 +0.7 +1.2
Mean 6.8 +0.7 +1.2
Rainfall (mm) 358.9 91% 109%

 

 

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March 2022

Driest since 1993, second warmest on record and sunniest (at Valley) for 80-years

Stormy towards the middle of the month turning wintry at the end.

It was the driest March in Llansadwrn records since 1993, ranking 7th since records began in 1928. Rainfall was 29.1 mm (32%) & [37%] of records with the largest fall not even reaching double figures 9.4 mm on the 11th. There were 14 days with no precipitation; 17 dry days; 14 rain days; 9 wet days and just one 5 mm, or more, 5.3 days below the decadal average. Rainfall duration (wet hours) was 61 hours

It was wetter again at Gorwel Heights in Llanfairfechan with 45.8 mm (53%) & [55%] of averages, but least since 2014. The wettest day was on the 12th with 12.8 mm. There were 15 dry days; 16 rain days; 7 wet days and 4 had 5 mm, or more. Rainfall duration was 58 hours with a greater rate of fall 0.8 mm/h than Llansadwrn 0.5 mm/h. .

It was the second warmest March on record in Llansadwrn with a mean temperature of 8.8C [(+1.7)] of averages. In station records back to 1979 only 2012 had a higher 9.5C mean. The mean maximum was 12.7C [(+2.5)] with the highest 19.8C on the 22nd with the lowest 7.2C on the wintry 31st. The mean minimum was 4.8C [(+1.0)] with the highest 9.2C on the 10th. There was one air frost -1.1C on the 7th lasting just 3.3h, and 8 ground frosts the lowest -4.7C on the 7th.

The mean temperature at Gorwel Heights was 9.4C (+1.6) & [+1.8] of averages highest since 2012. The mean maximum was 12.6C highest equal with 2012, the highest maximum was 19.8C on the 22nd and the lowest 7.0C on the 31st. The mean minimum was 6.1C highest since 2017. There were no air frosts with the lowest minimum 1.2C on the 31st.

March Anglesey sunshine duration anomaly 1931-2022.

 

Sunshine at RAF Valley was 193.3h the most since 1942 203h, Kipp & Zonen adjusted values, the highest on the Anglesey record since 1931. The sunniest days this year were on the 18th and 20th each with 11.2h. Eight days saw 10h, or more. There were 2 sunless days.

 

In Llansadwrn global solar radiation for the month averaged 11.22 MJ m -2 with the brightest day on the 31st having 18.15 MJ m -2. The dullest day was on the 2nd with 2.20 MJ m -2 , there were 4 sunless days.

 

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April 2022

Rainfall below averages, temperatures above average with sunshine on average in recent years

Wintery and wettest in first quarter thereafter warm, dry and sunny

Rainfall of 36.2 mm (71%) & [55%] of averages was most since 2019, but ranked 20th lowest in Llansadwrn since 1928. The largest fall was only 8.0 mm on the 3rd and here were 16 (+3.3) days with no precipitation. Dry days were 19 (+3.6); rain days 11 (-3.5); wet days 9 (-1.0); and just 3 days (-0.3) with 5 mm, or more. A little more rain at Gorwel Heights, Llanfairfechan, the 40.4 mm (64%) & [53%] of averages most since 2019. The wettest day was on the 4th with 6.2 mm. There were 18 dry days; 12 rain days; 10 wet days; and 4 days reached 5 mm, or more. Rainfall duration (wet hours) was 61h at both stations.

The mean temperature in Llansadwrn 9.5C (+0.5) & [+0.4] of averages was highest since 2020 and ranked 12th in station records since 1979. The mean maximum was 13.5C the highest maximum 19.7 was on the 17th and the lowest 8.4C (+0.6) on the 1st. The mean minimum was 5.5C and the lowest 0.1C (-0.7) on the 9th. No air frost, but 6 (-2.6) ground frosts the hardest on the 9th -3.8C (-0.4). At Gorwel Heights the mean temperature was 10.1C (+0.8) & [+0.5] of averages. The highest maximum was 20.8C on the 17th, the lowest maximum 7.0C on the 1st. The highest minimum was 10.1C on the 15th and the lowest 2.5C on the 3rd.

Sunshine reported at Valley was provisionally 179.9h least since 2019, but ranked 24th highest on the Anglesey record since 1931. The sunniest days was on the 25th when there were 13.5h, there was only one sunless day at Valley, but three in Llansadwrn.

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May 2022

Just below average rainfall with above average temperatures

Changeable through the month

The mean temperature 12.7C [(+0.9)] was highest since 2020 and ranked 8th in station records since 1979. The mean maximum was 16.4C (+0.6) & [+0.5] of averages highest since 2018, but ranked only 16th. The highest maximum was 20.8C on the 15 (-1.5) and the lowest 10.9C on the 1st (+0.4). The mean minimum 9.2C was [(+1.3)] with the lowest 6.0C on the 29th (+2.8). The lowest grass minimum on the 27th was 2.2C (+2.9).

At Gorwel Heights, Llanfairfechan, the mean temperature was 13.8C (+1.3) [+1.2] of averages highest in May on record at the station. The mean maximum was 17.1C with the highest maximum 22.3C on the 16th and the lowest 11.8C on the 30th. The mean minimum was 10.4C with the highest 13.8C on the 16th and 17th and the lowest 7.5C on the 29th.

Rainfall of 66.5 mm was largest since 2020 (91%) & [98%] of averages, the third consecutive month with below average rainfall. The 3-month (Spring) total was 131.8 mm, least since 2020 ranked 8th lowest in Llansadwrn records since 1928. The largest fall, not reaching double figures,l was 9.2 mm on the 9th. Rainfall at Gorwel Heights was 54.0 mm (71%) & [70%] of averages, again the third consecutive month below averages. The March to May (Spring) rainfall totalled 140.2 mm the least on record since 2011.

Sunshine at RAF Valley totalled 187.3h with 3 sunless days. The sunniest day was on the 27th having 13.4h.

 

Spring 2022

The spring mean temperature 10.3C highest since 2011 (10.4C) ranked 2nd highest in station records since 1979. Spring rainfall 131.8 mm was least since 2020 and ranked 8th lowest in Llansadwrn records since 1928.

Spring seasonal averages Anomalies
10-y 30-y
Temperature (C)
Mean maximum 14.1 +1.3 +1.2
Mean minimum 6.5 +0.9 +0.8
Mean 10.3 +1.1 +1.0
Rainfall (mm) 131.8 61% 62%

 

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June 2022

A dry and sunny month with near average temperatures

Rain at the beginning and end when warmest

Rainfall of 47.2 mm (59%) & [64%] of averages was most since 2020, but ranked 27th lowest in Llansadwrn records since 1928. Rainfall since January totalled 374.7 mm lowest since 2013 and ranked 5th lowest. The wettest day had 10.4 mm this was on the 25th and there were 13 (+1.4) days with no precipitation. Dry days numbered 17 (+1.9); rain days 13 (-1.9); wet days 11 (-0.3) and days with 5 mm, or more, just 2 (-3.3). Rainfall at Gorwel Heights, Llanfairfechan, was 34.4 mm (43%) & [44%] of averages, least since 2018 (18.4 mm). here there were 17 dry days; 13 rain days; 10 wet days and only 1 reached more than 5 mm on the 26th when 11.0 mm fell. Rainfall duration (wet hours) was 53 h while in Llansadwrn it was nearly double at 92 h.

The mean temperature 14.3C (-0.2) & [+0.2] of averages was lowest since 2019 and ranked 20 in station records since 1979. The mean maximum was 17.9C with the highest 24.8C on the 23rd in a spell of 3 days (21-33) with 20C, or more. The lowest maximum was 11.2C on the 5th. The mean minimum was 10.6C with the highest 14.8C on the 17th and lowest 6.6C on the 19th that also had the lowest grass minimum of 3.5C. At Gorwel Heights the mean temperature was 15.4C. The mean maximum was 19.0C with the highest maximum 26.0C on the 17th and the lowest 11.7C on the 5th. The mean minimum was 11.7C with the highest 15.9C on the 17th and the lowest 8.9C on the 1st.

It was the 9th sunniest June on the Anglesey record since 1931.

 

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July 2022

Record maximum temperatures were recorded in Llanfairfechan... and in Britain several stations recorded in excess of 40C for the first time

Briefly hot on the 17th, 18th and 19th. Rainfall was below averages

It was intensely hot on the 18th and 19th in Llanfairfechan with Gorwel Heights and Gorddinog recording maxima of 37.0C on the 19th. At Gorwel Heights the previous two days had 31.1C on the 17th and 35.3 C on the 18th. The highest temperature in Llansadwrn was 33.3C on the 19th, the second highest on record below the 34.9C recorded on 19th July 2006.

Despite the 3 days of heat the mean temperature in Llansadwrn 17.1C was lowest since 2020 and ranked 8th in station records since 1979. The mean maximum 21.0C again lowest since 2020 ranked 10th and the mean minimum 13.1C ranked 8th. The highest minimum 21.2C on the 19th, also recorded at Gorwel Heights, was highest in station records for any month. The previous highest minimum in Llansadwrn was 19.6C on 2 August 1995 and at Gorwel Heights 20.5C on 24th July 2014.

Rainfall in Llansadwrn was 32.3 mm (37%) & [42%] of averages, least since 2006 ranking 11th in Llansadwrn records since 1928. The wettest day was on the 1st with 10.2 mm. There were 15 days (+5.1) with no precipitation and 21 (+7.7) dry days. Rain days numbered 10 (-7.8); wet days 8 (-5.3) and there were 3 (-3.1) days with 5 mm, or more. A Gorwel Heights rainfall was 41.2 mm (46%) & [52%] of averages. Here the wettest day on the 1st had 14.2 mm. There were 19 dry days; 12 rain days; 8 wet days and 3 had 5 mm, or more. Rainfall duration (wet hours) was 64 h in Llansadwrn and 47 h at Gorwel Heights.

Sunshine at RAF Valley totalled 198.8h sunniest since 2020 ranking 15th on the Anglesey record since 1931. The sunniest day was on the 16th with 12.9h and there were 2 sunless days.

 

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August 2022

Warm, mostly dry and sunny

A wet day on the 1st just two sunless days with a hot day on the 14th

The month began with a really wet day 37.0 mm, the wettest day of a dry year so far, and ended with a total of 67.4 mm (56%) & [75%] of averages, lowest in August since 2018, ranking 26 in Llansadwrn records. The annual total 474.4 mm so far is drier than the driest year on record 1945 that had 479.3 mm to the end of August. There were 15 days (+7.5) with no precipitation and 18 (+5.5) dry days (<0.2 mm). Rain days were 13 (-5.6); wet days 5 (-4.5) and just two had 5 mm, or more, bucking the trend of recent years (-3.0).

Rainfall at Gorwel Heights, Llanfairfechan, totalled 73.6 mm (73%) & [84%] of averages, lowest on record at this station (12 years) previous least 74.8 mm in 2012. The wettest day was on the 1st having 35.8 mm (rank 4). There were 20 dry days; 11 rain days; 5 wet days; and 5 had 5 mm, or more.

A warm month the mean maximum in Llansadwrn 17.5C (+1.8) & [+1.9] of averages highest since 1997 ranking 3 in station records since 1979. The mean maximum was impressively (+2.7) & [+2.6] of averages with one hot day on the 13th having 31.7C (+7.7) in a spell of 10 warm (>20C) days 6-15th, the lowest maximum 17.3C (+3.3) was on the 16th. The mean minimum 13.4C (+0.9) & [+1.1] was joint highest since 1997 ranking 3,, the lowest minimum 8.6C (+0.3) was on the 5th, he highest 18.2C (+2.3) on the 13th. The lowest grass minimum 6.0C (+1.4) was on the 5th. .

Sunshine at RAF Valley was provisionally 243.4h with 1 sunless day. Sunniest were the 10th and 11th with 14.0h each.

Summer 2022

Driest since 2018 and ranking 10th driest in Llansadwrn records back to 1928. Temperatures were above the averages with the mean 16.3C highest since 2006 ranking 4th in station records since 1979. Sunshine at RAF Valley totalled 679.3h most since 2018 ranked 4th on the Anglesey record since 1931.

Summer seasonal averages Anomalies
10-y 30-y
Temperature (C)
Mean maximum 20.1 +1.3 +1.5
Mean minimum 12.4 +0.4 +0.7
Mean 16.3 +0.9 +1.1
Rainfall (mm) 146.9 55% 61%

 

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Monthly data 2022

Llansadwrn (Anglesey): Monthly weather data summary for 2022
Anomaly ~ is based on the 2012-21 average.
Anomaly 30-y is based on the 1991-2020 average.
.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Air temperatures (C)
.
Mean max 8.6 9.6 12.7 13.5 16.1 17.9 21.0 21.5 15.1
Mean min 4.0 4.2 4.8 5.5 9.2 10.6 13.1 13.4 8.1
Mean 6.3 6.9 8.8 9.5 12.7 14.3 17.1 17.5 11.6
Anomaly~ 0.8 1.2 1.7 0.5 0.9 -0.2 1.0 1.8 0.2
Anomaly 30-y 0.9 1.3 1.7 0.4 0.9 0.2 1.3 1.9 0.4
High max 12.8 12.1 19.6 19.7 20.8 24.8 33.3 31.1 33.3
Date 1 21 22 17 15 23 19 13 .
Low max 4.2 5.9 7.2 8.4 10.9 11.2 17.4 17.3 4.2
Date 24 18 31 1 1 5 1 16 .
High min 11.6 7.6 9.2 9.0 13.2 14.8 21.2 18.2 21.2
Date 1 2 10 16 16 17 19 13 .
Low min 0.9 0.8 -1.1 0.1 6.0 6.6 8.9 8.6 -1.1
Date 21 11 7 9 29 19 27 5 .
Grass min -3.7 -4.1 -4.7 -3.8 2.2 3.5 5.8 6.0 -4.7
Date 30 11 7 9 27 19 27 5 .
.
MSL Pressure at 09 GMT (mb) 1025 1012 1022 1017 1017 1015 1021 1018 1018
Highest 1042 1032 1042 1034 1029 1026 1035 1031 1042
Date 12 11 18 29 28 13 8 6, 9 .
Lowest 993 977 994.0 980.0 1001 996 1004 1002 977.0
Date 8 18 13 7 23 24 19 15 .
.
Means at 0900 GMT .
Air temperature (C) 5.7 6.6 8.5 9.6 12.8 14.9 17.0 17.9 11.6
Dew point (C) 4.4 5.4 5.3 6.9 10.9 11.8 14.0 14.9 9.2
RH% 92 92 81 84 89 82 84 83 86
Soil temperatures (C) .
.
5 cm 5.1 6.0 7.2 10.3 14.3 16.6 18.3 18.4 12.0
10 cm 5.5 6.3 7.0 9.6 13.4 15.2 17.2 17.1 11.4
20 cm 5.8 6.5 7.5 10.2 13.5 15.4 17.3 17.7 11.7
30 cm 6.8 7.4 8.2 10.7 13.8 15.7 17.4 17.9 12.2
Anomaly~ 1.0 1.8 1.0 0.6 0.9 -0.2 0.1 0.8 0.8
50 cm 7.3 7.6 8.6 10.8 13.5 15.4 17.1 17.7 12.3
100 cm 8.3 8.2 8.7 10.6 12.8 14.5 16.0 16.8 12.0
Anomaly~ 0.7 1.2 0.8 0.8 0.9 0.1 0.2 0.6 0.4
.
Rainfall (mm) .
.
Rain tot 62.8 132.9 29.1 36.2 66.5 47.2 32.3 67.4 474.4
Rain % ave~ 54 123 32 71 91 59 37 66 38
Rain % 30-y 61 147 37 55 98 64 42 75 41
Days 0.0 8 3 14 15 8 13 15 15 91
Days <0.2 13 6 17 19 13 17 21 18 124
Days >=0.2 18 22 14 11 18 13 10 13 119
Days >=1.0 11 16 9 9 15 11 8 9 88
Days >=5.0 4 14 1 3 5 2 3 2 34
Max fall 15.8 15.8 9.4 8.0 9.2 10.4 10.2 37.0 37.0
Date 1 8 11 3 9 25 1 1 .
Highest rate (mm/h) 61 32 14 22 14 30 25 79 79
Date 1 5 11 12 17 30 27 26 .
Average rain per hour (mm) 0.8 0.9 0.5 0.6 0.7 0.5 0.5 1.1 0.7
.
Evaporation .
.
Piche (mls/ mm) 17.2 19.8 37.4 25.6 26.5 41.3 57.4 60.4 285.6
Lysimeter PE (mm) 10.2 31.1 26.4 46.1 30.7 68.8 76.4 66.7 356.4
AWS ET calculated 11.4 22.9 50.6 56.9 66.5 76.7 70.2 73.0 428.2
.
Weather (days) .
.
Air frost 0 0 1 0 0 0 0 0 1
Ground fr 17 10 8 6 0 0 0 0 41
Sl/snow 3 1 1 1 0 0 0 0 6
Sn lying 0 0 0 0 0 0 0 0 0
Thunder 1 1 0 0 0 1 0 1 4
Hail <5 mm 8 5 1 2 0 0 0 0 16
Hail >=5 mm 0 1 1 0 0 0 0 0 2
Fog at 09h 0 0 0 0 0 0 0 1 1
Gales in SE Anglesey 2 3 2 2 0 0 0 0 9
.
Wind direction at 09h (days) .
.
N 3 0 3 4 1 2 4 5 22
NE 2 0 2 5 3 5 6 4 27
E 1 0 6 7 0 4 0 6 24
SE 0 1 4 0 2 0 0 0 7
S 8 2 4 2 3 5 3 4 31
SW 7 13 6 7 16 11 9 4 73
W 5 11 0 3 5 3 7 4 38
NW 2 1 0 1 0 0 0 2 6
Calm 3 0 6 1 1 0 2 2 15
.
Wind speed mph .
.
Daily mean 5.7 10.0 4.4 4.4 4.9 4.1 2.9 3.1 4.9
Highest daily mean 15.6 18.1 12.8 17.1 12.5 13.2 10.9 12.6 18.1
Date 1 20 9 6 10 10 24 2 .
Mean gust 19.7 30.6 18.5 17.0 17.6 16.0 14.3 12.8 18.3
Highest gust 44 44 39 45 32 39 37 33 45
Date 1 20 13 7 9 10 24 20 .
.
AWS records of rainfall and frost .
.
Wet hours (with 0.2 mm,or more) 79 148 61 61 89 92 64 61 655
Frost duration (h) 0 0 3.3 0 0 0 0 0 3.3
.
Cloud cover at 09h. Mean % 79 86 58 72 88 82 85 64 77
.
Global solar radiation (MJ m-2) .
.
Llansadwrn
Sol rad mean 2.77 5.50 11.22 15.00 16.32 18.61 16.33 16.13 12.74
Maximum 5.95 13.97 18.15 25.20 27.87 29.24 29.93 24.05 29.93
Date 27 27 31 25 19 1 10 10 .
Minimum 1.18 0.98 2.20 2.67 4.28 5.60 7.53 5.00 0.98
Date 2 5 2 12 1 5 30 2 .
Brightest hour W/sq m 304 483 684 800 902 879 849 756 902
during hour beginning GMT 12 12 12 12 11 13 12 12 12
on day 27 27 31 25 29 27 10 11 .
Sunless days 7 7 4 3 2 1 2 2 28
.
Sunshine (h) .
[ ~ missing days are derived] .
Valley 67.4 76.1 193.3 179.9 187.3 237.1 198.8 243 1383.3
Average %~ 141 91 154 100 84 115 99 144 89
Average 30-y 119 97 160 110 93 126 113 149 94
Sunniest 7.0 8.8 11.2 13.5 13.4 15.0 12.9 14.0 15.0
Date 14 27 18, 20 25 27 20 16 10, 11 .
Sunless days 8 7 2 1 3 2 2 1 26
.
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 2022
Anomalies based on 30-y [1991-2020] # & 10-y averages (2012-2021) *
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Air temperatures (C)
.
Mean max 9.3 10.8 12.6 13.5 17.1 19.0 21.9 21.7 15.7
Mean min 5.2 5.3 6.1 6.7 10.4 11.7 14.3 14.6 9.3
Mean 7.3 8.1 9.4 10.1 13.8 15.4 18.1 18.2 12.5
Anomaly (2012-2021) * 0.8 1.5 1.6 0.8 1.3 0.2 1.4 1.6 1.3
Anomaly [1991-2020] # 1.1 1.9 1.8 0.5 1.2 0.4 1.4 1.4 1.9
High max 14.4 14.6 19.8 20.8 22.3 26.0 37.0 31.5 37.0
Date 1 16 22 17 16 17 19 13 .
Low max 5.1 5.6 7.0 7.0 11.8 11.7 16.8 16.0 5.1
Date 24 24 31 1 30 5 27 16 .
High min 12.6 8.9 9.9 10.1 13.8 15.9 21.2 20.2 21.2
Date 1 2 10 15 16, 17 17 19 13 .
Low min 2.3 2.6 1.2 2.5 7.5 8.9 10.7 11.2 1.2
Date 25 24 31 3 29 1 27 5 .
.
MSL Pressure at 09 GMT (mb) 1025 1012 1022 1017 1017 1015 1021 1018 1018
.
Highest 1042 1033 1043 1034 1029 1026 1035 1031 1043
Date 12, 20 11 18 29 28 13 8 6 .
Lowest 993 977 995 980 1001 996 1003 1002 977
Date 8 18 13 7 23 24 25 22 .
.
Means at 0900 GMT
Air temperature (C) 6.9 7.7 9.2 10.2 13.6 15.7 17.7 18.5 12.4
Dew point (C) 4.2 4.9 4.4 5.8 9.6 10.8 13.2 14.0 8.4
RH% 83 83 73 74 78 74 77 76 77
.
Rainfall (mm)
.
Total 53.6 144.4 45.8 40.4 54.0 34.4 41.2 73.6 487.4
% (2012-2021) * 58 170 53 64 71 43 46 73 42
% [1991-2020] # 60 193 55 53 70 48 52 84 44
Max fall 8.4 17.4 12.8 6.2 7.2 11.0 14.2 35.8 35.8
Date 8 5 12 4 17 26 1 35.8 .
Highest rate (mm/h) 128 84 13 32 14 23 36 74 128
Date 8 5 12 6 17 26 28 1 .
.
Wet hours (with 0.2 mm, or more) 74 129 58 61 72 53 47 45 539
Average rain per hour (mm) 0.7 1.1 0.8 0.7 0.8 0.6 0.9 1.6 0.9
.
Days <0.2 13 6 15 18 11 17 19 20 119
Rain >=0.2 18 22 16 12 20 13 12 11 124
Wet >=1.0 15 16 7 10 12 10 8 5 83
Days >=5.0 5 11 4 4 6 1 3 5 39
.
Weather (days) .
.
Air frost 0 0 0 0 0 0 0 0 0
Frost duration (h) 0 0 0 0 0 0 0 0 0.0
Wind direction at 09h (days) .
.
N 0 0 3 5 2 4 4 3 21
NE 0 0 2 4 4 2 3 3 18
E 1 0 2 3 0 3 0 2 11
SE 5 3 7 3 3 1 0 2 24
S 8 9 4 2 7 5 3 3 41
SW 5 11 4 3 7 5 3 4 42
W 3 2 0 2 1 1 3 2 14
NW 4 3 2 5 4 6 9 7 40
Calm 5 0 7 3 3 3 6 5 32
.
Mean mph 3.6 5.6 5.6 3.8 2.5 2.8 1.7 2.1 3.5
Highest daily mean mph 15.5 14.5 17 11.4 6.3 7.9 4.5 5.1 17.0
Date 1 12 19 11 9 26 24 2 .
Mean gust 20.4 28.5 24.6 20.4 17.6 17.0 13.2 13.8 19.4
Highest gust 55 47 48 44 33 40 29 27 55
Date 16 12 12, 13 11 17 28 23 1, 2 .
.
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, any missing observations are initially derived from nearby stations to complete the record, up to date figures are later gathered from the Met Office website. I am grateful Ivor McLean former Met Officer at RAF Valley for early Holyhead sunshine and various other observations; David Lee for use of his observations from Gorddinog; and Gordon Perkins (BlueTractorSoftware) for observations at Gorwel Heights, programming and additional observations.



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