2012 weather summaries Llanwnnen

2012 Summaries and Stats Llanwnnen

January

Summary:

Mild and fairly unsettled, hardly any cold

Temperatures ended up about 1c above average, and rainfall a little below average. No snow lay at all, although it did on higher ground above 200m close by at the end of the month.

1^st- 5^th: Mild, very unsettled, with strong winds and spells of heavy rain or showers. Gales force winds on both 3^rd and 5^th.

6^th- 12^th: With high pressure close to southern Britain, it was a rather cloudy, very mild and damp spell with drizzle on and off. The temperature was between 6c and 12c throughout.

13^th – 17^th: Same high pressure but with a SE feed, rather cold, sunny periods by day but night frosts, as low as -4.4c on the 14^th. Thick fog persisted into the afternoon on the 13^th.

18^th – 25^th: Very mild and unsettled, rain or showers at times, and windy at times too, and some sunny spells. Month’s high of 12.1c on the 24^th.

26^th- 28^th: Colder, a few showers and night frosts.

29^th- 31^st: Mostly cold, slight frosts. Light rain, sleet and snow at times, but a dry final day.

Total rainfall: 108.2mm

Wettest day: 19.1mm 2^nd

Rain days >0.2mm: 23
Wet days >1.0mm: 17
Days of heavy rain >10mm: 4
Mean temperature: 5.8c

Mean Max: 8.5c

Mean Min: 3.1c

High max: 12.1c 24^th
Low Max: 2.8c 30^th

High min: 9.3c 1^st
Low min: -4.4c 14^th

Air frost: 8

Ground frost: 14

Mean RH: 91%

High RH: 100% various
Low RH: 73% 16^th

Predominant wind directions: WSW/ SSE
Mean wind speed: 1.8mph
Mean pressure: 1021mbar
Max pressure: 1035mbar 13^th
Min pressure: 991mbar 3^rd

Days with:

Hail: 5
Gale: 2

Snow or sleet: 2

Snow lying 0900: 0
Thunder: 0
Fog: 1

Fog at 0900: 1

February 2012

Mostly cold and frosty to the 11^th; thereafter it was mild or very mild. Rainfall was well below average.

The two distinct phases resulted in average temperatures overall. The third and final month of the Winter saw no lying snow again. Not checked back, but I doubt many months in history have had mean pressure above 1030mbar?

1^st – 3^rd: Very cold, with sunny days and frosty nights. The coldest temperature of the Winter minimum of -10.2c was on the 3^rd.

4^th- 6^th: Hard frost again 4^th, then it became less cold with sleet and rain. Mostly dry a few sunny intervals 5^th and 6^th.

7^th- 9^th: Cold again, generally dry and frosty. Rain did arrive later on the 9^th.

10^th and 11^th: Rather cold and cloudy with rain at times.

12^th-22^nd: Mild and unsettled, rain or drizzle at times, and plenty of cloud. Heavy rain fell on the 18^th.

23^rd- 29^th: Very mild and mostly dry. Rather cloudy. There were though slight frosts and sunny spells the weekend of the 25^th and 26^th.

Stats

Total rainfall: 64.2mm

Wettest day: 14.5mm 9,18^th

Rain days >0.2mm: 16
Wet days >1.0mm: 9
Days of heavy rain >10mm: 2
Mean temperature: 5.0c

Mean Max: 8.2c

Mean Min: 1.7c

High max: 14.4c 23^rd
Low Max: 1.9c 3^rd

High min: 10.6c 23^rd
Low min: -10.2c 3^rd

Air frost: 10

Ground frost: 13

Mean RH: 91%

High RH: 100% various dates
Low RH: 65% 1^st

Predominant wind directions: SSE
Mean wind speed: 1.7mph
Mean pressure: 1031mbar
Max pressure: 1043mbar 8^th
Min pressure: 1008mbar 18^th

Days with:

Hail: 2
Gale: 0
Thunder: 0
Fog: 4

Fog at 0900: 2

Snow or sleet: 5

Snow lying 0900: 0

March 2012, Llanwnnen, Lampeter, Ceredigion

Very mild and very dry

The driest month since April 2007 (14mm), and slightly drier than March 2011 (28mm) and less than 1mm fell in the final 2 weeks. Very mild too, in fact with average maxima of 13.9c which is higher than the April mean. An exceptionally warm and sunny spell occurred towards the end, with temperatures close to 70f (21c), and not far off the all time March record. No sleet or snow fell at all, quite unusual for this month.

1^st- 2^nd: First two days were dry, and after ground frosts, and fog 2^nd, some sunny spells; Very mild.

3^rd- 7^th: Unsettled and quite windy, rain or showers at times, sunny spells too. Temperatures close to average, but cool on the 4^th.

8^th- 15^th: The Azores high pressure gradually transferred across England and east into the North Sea. Mostly dry but rather cloudy, even some drizzle at times. Mist and fog quite a feature 12^th- 15^th. Mild, and became very mild on some of the brighter days.

16^th- 17^th: Mild and rather windy with a little rain at times, also a little sunshine.

18^th- 21^st: High pressure in charge again. Dry with some sunny spells. A sharp frost on the 19^th, down to -4c, but otherwise fairly mild.

22^nd- 28^th: Very warm/ exceptionally warm: Dry and mostly sunny. Near record March temperatures, exceeding 20c for 4 consecutive days, the peak high’s being 20.9c on both the 26^th and 27^th. A gentle continental flow brought the warm air about a high over the North Sea. The warmth of the day did not prevent slight frosts given March has long nights still.

29^th-31^st: Much cooler, some more frost, but remained dry. A sunny 29^th then it was rather cloudy and breezy.

Statistics

Total rainfall: 23.5mm

Wettest day: 7.4mm 3rd

Rain days >0.2mm: 12
Wet days >1.0mm: 7
Days of heavy rain >10mm: 0
Mean temperature: 8.8c

Mean Max: 13.9c

Mean Min: 3.7c

High max: 20.9c 26/27^th
Low max: 6.9c 4^th

High min: 8.4c 10^th
Low min: -4.0c 19^th

Air frost: 4

Ground frost: 12

Mean RH: 83%

High RH: 100% various dates
Low RH: 35% 27th

Predominant wind directions: SSE
Mean wind speed: 1.4mph
Mean pressure: 1028mbar
Max pressure: 1041mbar 10th
Min pressure: 1009mbar 17th

Days with:

Hail: 2
Gale: 0
Thunder: 0
Fog: 6

Fog at 0900: 2

Sleet or snow 0

April 2012 Llanwnnen, Ceredigion

Cool and wet; plenty of April showers

No further hints of Summer after the unseasonable warmth of late March and we did not reach 60f until the final day. It is quite unusual for April to average out colder than the previous month of March, and this year by well over a degree. Plenty of useful rain after the dry start to 2012, this was the wettest April since 1998 which had 186mm at nearby Lampeter University.

1^st- 2^nd: Dry with sunny spells after frost

3^rd- 4^th: Became very cool and windy with some rain, maximum only 4.9c on 4^th.

5^th- 6^th: Mostly dry, severe frost 6^th, minimum -6.0c

7^th- 10^th: Very unsettled, rain and showers, some heavy. A little sunshine at times, temperatures near average

11^th- 12^th: Llanwnnen dodged the April showers for a couple of days giving sunny periods with near average temperatures

13^th- 16^th: Some sun with showers, some heavy, cool to average temperatures, frosts overnight.

17^th- 26^th: Very unsettled, rain or showers at times, some heavy. Windy at times; near average temperatures and a few more frosts. Pressure fell down to 975mbar on the 18^th the lowest level for 17 months.

27^th- 30^th: Mix of very cool and quite mild conditions. There was some further rain at times, and last two days saw strong winds. We missed the heavy rain on the 29th with the north-east winds creating a rain shadow over Ceredigion, just 5mm falling here, while some other parts of Wales saw almost 2 inches (50mm). Highest temperature of the month on it's final day was just 16.3c.

Total rainfall: 126.0mm

Wettest day: 16.7mm 9^th

Rain days >0.2mm: 24
Wet days >1.0mm: 22
Days of heavy rain >10mm: 4
Mean temperature: 7.3c

Mean Max: 11.9c

Mean Min: 2.6c

High max: 16.3c 30th
Low Max: 4.9c 4th

High min: 7.4c 9th
Low min: -6.0c 6th

Air frost: 6

Ground frost: 13

Mean RH: 84%

High RH: 97% 10th
Low RH: 46% 16^th

Predominant wind directions: NW
Mean wind speed: 1.8mph
Mean pressure: 1004mbar
Max pressure: 1028mbar 15th
Min pressure: 975mbar 18th

Days with:

Hail: 5
Gale: 0
Thunder: 0
Fog: 2

Fog at 0900: 1

Sleet or snow falling: 1

Snow lying at 0900: 0

May 2012

Overall a rather average month: rather cool but then a very warm last week

A largely nondescript month with mostly cool and sometimes damp conditions, was remedied by some unusual May warmth and sunshine near the end. The high of 28c on the 25^th being just short of the all time Welsh record for the month. Nothing else so noteworthy with respect to either temperature or rainfall, which ended up rather below average.

1^st – 10^th: Changeable with some rain at times but some sunny intervals too. Temperatures cool to average.

11^th – 13^th: A transient high pressure brought a short dry interlude with sunny spells. Cool with ground frosts by night, as low as 0.4c 13^th.

14^th- 15^th: Rain and showers, plenty of hail, cool and windy.

16^th – 18^th: Mostly dry and milder, sunny intervals. Further ground frosts by night.

19^th – 21^st: Dry and became sunny with temperatures around average.

22^nd – 30^th: Clear with another ground frost 22^nd, this heralding a prolonged warm to hot spell for the end of May. Mostly sunny with mild nights after 22^nd. Unusually warm for May in west Wales during the 25^th and 26^th, both days exceeding 80f, the highest reading of 28.1c on the former, just short of the record of 29c for the Principality.

31^st: A much cooler, dull and damp finale to the month.

Total rainfall: 52.7mm

Wettest day: 11.6mm 9^th

Rain days >0.2mm: 12
Wet days >1.0mm: 9
Days of heavy rain >10mm: 1
Mean temperature: 11.9c

Mean Max: 17.3c

Mean Min: 6.4c

High Max: 28.1c 25th
Low Max: 11.4c 15th

High Min: 13.6c 26th
Low Min: 0.4c 13^th

Air frost: 0

Ground frost: 7

Mean RH: 76%

High RH: 96% 2nd
Low RH: 42% 26th

Predominant wind directions: NW
Mean wind speed: 1.3mph
Mean pressure: 1017mbar
Max pressure: 1041mbar 12^th
Min pressure: 1001mbar 10th

Days with:

Hail: 0
Gale: 0
Thunder: 0
Fog: 5

Fog at 0900: 0

June 2012, Lampeter, Ceredigion, Wales

Very unsettled, exceptionally wet, quite cool and dull

Frequent rains in a very low pressure dominated month. Perhaps the wettest ever for this area, much wetter than 2007 (186mm), and the only comparable month I can find is June 1982 when 213mm fell at Carmarthen. Although a cool and quite a dull month, not as poor as further north and east. A remarkable month for rainfall, 3 days with over 1 inch falling, 5 with over 20mm, and 8 over 10mm.

.

1^st / 2^nd: Warm with sunny intervals, rain later 2^nd

3^rd – 8^th: Cool and very unsettled. An unusually deep Summer low brought periods of heavy rain during 7^th and 8^th, almost 60mm falling, and gale force winds 8^th, which was especially cool, no higher than 11c during the day time.

9^th – 13^th: Relatively dry interlude, a few showers with some better sunny spells, and average temperatures.

14^th – 17^th: Another deep Summer low crossed the UK, bringing a second notably wet spell, this time with 70mm in 72 hours. Cool to very cool, dull and windy too.

18^th – 20^th: Mostly dry and bright with temperatures up to average, Rain late on 20^th.

21^st – 24^th: Unsettled, rain at times, heavy 21^st, mainly cloudy and rather windy and cool.

25^th - 27^th : Became warm and mostly dry with sunny spells

28^th -30^th: A warm humid morning 28^th, but then cooled off to a rather cool end to the month, with rain or showers at times. Rather windy.

Stats

Total rainfall: 218.3mm

Wettest day: 33.2mm 7^th

Rain days >0.2mm: 25
Wet days >1.0mm: 22
Days of heavy rain >10mm: 8
Mean temperature: 13.9c

Mean Max: 18.0c

Mean Min: 9.7c

High Max: 23.6c 27^th
Low Max: 12.0c 8^th

High min: 14.5c 28^th
Low min: 5.1c 10^th

Air frost: 0

Ground frost: 0

Mean RH: 87%

High RH: 100% various dates
Low RH: 50% 20th

Predominant wind directions: SE
Mean wind speed: 2.1mph
Mean pressure: 1009mbar
Max pressure: 1021mbar 1st
Min pressure: 980mbr 8th

Days with:

Hail: 0
Gale: 1
Thunder: 1
Fog: 3

Fog at 0900: 0

July 2012, Llanwnnen, Ceredigion

Unsettled and rather wet, fine warm spell 21^st – 26^th. Near normal temperatures

A poor Summer month, redeemed somewhat by one fine and warm week towards the end. Most of the rainfall was during the first 18 days, all of which had at least a trace deposited in the rain gauge. Only half as wet as June though.

1^st – 6^th: Mostly cool and very cloudy with rain at times; a mostly dry and brighter 5^th though.

7^th – 11^th: Sunny intervals but still with some rain or showers from time to time. Rather warm 7^th but became very cool.

12^th – 18^th: Very chilly night the 12^th down to just 5.2c. Unsettled and quite cool, spells of rain and showers, heavy at times, sunny intervals between times.

19^th – 26^th: Dry with sunny spells, warm to very warm. Peak temperature 26.5c on the 24^th.

27^th – 31^st: Rather cool, mostly dry with sunny spells. A 9 day dry spell ended with a few showers on the 28^th – this the longest dry spell since March. Rain on the final day.

Statistics

Total rainfall: 100.5mm

Wettest day: 14.9mm 13^th

Rain days >0.2mm: 19
Wet days >1.0mm: 18
Days of heavy rain >10mm: 4
Mean temperature: 14.8c

Mean Max: 19.3c

Mean Min: 10.2c

High Max: 26.5c 24^th
Low Max: 13.7c 6^th

High Min: 14.4c 23^rd
Low Min: 5.2c 12^th

Air frost: 0

Ground frost: 0

Mean RH: 85%

High RH: 97% various dates
Low RH: 51% 21^st

Predominant wind directions: SSE and WNW
Mean wind speed: 1.5mph
Mean pressure: 1013mbar
Max pressure: 1026mbar 22^nd
Min pressure: 999mbar 13^th

Days with:

Hail: 0
Gale: 0
Thunder: 0
Fog: 5

Fog at 0900: 0

August 2012

Summary

Unsettled and very wet, temperatures average overall

August completed the wet Summer, being the third month over 100mm. Rainfall fell frequently with a total of 25 rain days. Nothing especially hot, 80f was reached once on the 10^th though, and were it not for a cool final week, it would have been a rather warm month. A very early ground frost on the final night down to 2.0c.

1^st – 7^th: Rain or showers at times, some heavy, with sunny intervals between. Temperatures around average but cool 7^th.

8^th – 12^th: Mostly dry and warm to very warm, high pressure close by. Peak temperature almost 27c 10^th.

13^th – 21^st: Unsettled but rather warm. Rain or showers, very heavy at times, sunny spells between them. Windy at times.

22^nd – 23^rd: Mostly dry with some sunshine and near normal temperatures.

24^th - 30^th : Unsettled and rather cool; showers or longer spells of rain, very heavy at times. 12mm fell in just 30 minutes early on the 29^th, making the 28^th - with 22.7mm the wettest day of the month. There was also some thunder 29^th. Very cool with a maxima of just 15.3c 30^th.

31^st: Very cool night with a touch of ground frost, although not as cool as 31^st August 2010 which fell to 1c. Sunny spells and a cool day, a little drizzle during evening.

Total rainfall: 158.9mm

Wettest day: 22.7mm 28^th

Rain days >0.2mm: 25
Wet days >1.0mm: 21
Days of heavy rain >10mm: 7
Mean temperature: 16.2c

Mean Max: 20.4c

Mean Min: 12.0c

High Max: 26.9c 10^th
Low Max: 15.3c 30^th

High Min: 17.2c 18^th
Low Min: 2.0c 31^st

Air frost: 0

Ground frost: 1

Mean RH: 86%

High RH: 97% 2^nd
Low RH: 49% 10^th

Predominant wind directions: SSE
Mean wind speed: 1.8mph
Mean pressure: 1012mbar
Max pressure: 1032mbar 31^st
Min pressure: 996mbar 24^th

Days with:

Hail: 0
Gale: 0
Thunder: 1
Fog: 1

Fog at 0900: 0

September 2012 at Lampeter, Ceredigion

Very cool: Dry first half then unsettled

Only small amounts of rain with just 14mm for the first half, and in spite of a wet second half the average (approx 100mm) was still not attained. Some warm weather during the first 8 days, but no real heat, then maxima almost exclusively below average to the month end, with some very cool days indeed. It was probably the coldest September since 1994.

1^st -8^th: Often warm and dry with sunny periods.

9^th – 22^nd: Rather unsettled and cool, mostly light rain or showers at times. Seasons first air frost 22^nd, minimum of -0.7c.

23^rd – 26^th: Very cool with spells of rain, heavy at times. The offshoot of hurricane Nadine bringing very disturbed weather with pressure below 990 mbar for 48 hours. Maxima below 11c on both the 23^rd and 25^th – the lowest in September for many years, perhaps back to 1986.

27^th – 30^th: Cool and rather unsettled with rain at times. Bright and dry 29^th.

Total rainfall: 80.3mm

Wettest day: 18.6mm

Rain days >0.2mm: 22
Wet days >1.0mm: 16
Days of heavy rain >10mm: 3
Mean temperature: 11.8c

Mean Max: 16.2c

Mean Min: 7.3c

High Max: 22.6c 8^th
Low Max: 10.5c 25^th
High Min: 13.9c 10^th
Low Min: -0.7c 22^nd

Air frost: 1

Ground frost: 2

Mean RH: 87%

High RH: 99% 17^th
Low RH: 37% 8^th

Predominant wind directions: SSE
Mean wind speed: 1.3mph
Mean pressure: 1015mbar
Max pressure: 1031mbar 5^th
Min pressure: 983mbar 26^th

Days with:

Hail: 0
Gale: 0
Thunder: 0
Fog: 4

Fog at 0900: 1

October 2012

Quite cool, unsettled

1^st – 11^th: Unsettled with rain or showers on most days. The rain, not often heavy until 11^th when 25mm fell. Temperatures cool to average (12 to 15c). Dry, bright interlude 6^th /7^th with some fog and frost.

12^th – 18^th: Very unsettled, quite cool and windy at times. Frequent rain or showers, heavy at times. Slight air frost 14^th.

19^th – 25^th: Mild to very mild and mainly dry. A rather cloudy spell after the 21^st, although some warm sunny intervals raised temperature to 16.9c on the 24^th.

26^th and 27^th: Dry and very cool, sunny latter, sharp frost 27^th minimum of -3.7c.

28^th – 31^st: Cool with rain at times, some very heavy, windy 31^st.

Total rainfall: 149.9mm

Wettest day: 24.5mm 11^th

Rain days >0.2mm: 24
Wet days >1.0mm: 18
Days of heavy rain >10mm: 6
Mean temperature: 9.2c

Mean Max: 13.0c

Mean Min: 5.4c

High Max: 16.9c 24^th
Low Max: 8.1c 27^th

High Min: 11.8c 23^rd and 24^th
Low Min: -3.7c 27^th

Air frost: 4

Ground frost: 8

Mean RH: 90%

High RH: 99% various
Low RH: 60%

Predominant wind directions: SSE
Mean wind speed:
Mean pressure: 1009mbar
Max pressure: 1025mbar 23^rd
Min pressure: 976mbar 31^st

Days with:

Hail: 1
Gale: 0
Thunder: 1

Lightning only: 1
Fog: 2

Fog at 0900: 1

November 2012

Cool and rather wet

A consistently unsettled month, often on the cool side, with only brief milder interludes. The most notable aspect was the very wet weather with localised flooding towards the end, when over 4 inches fell in the 7 days of 19^th to 25^th. There was quite a high incidence of frost for November with 12 sub zero nights, the lowest being -7.5c on the 29^th.

1^st – 4^th: Very cool and unsettled; rain or showers, some heavy. Sheet lightning observed on the evening of the 3^rd but too distant to hear thunder. Touches of frost by night.

5^th – 8^th: Fairly dry, just a little light rain or drizzle at times with near normal temperatures.

9^th – 12^th: Unsettled again with further rain or showers at times, some heavy. Mild 12^th.

13^th – 15^th: Mainly dry and mild, cold with frost and fog 15^th.

16^th – 26^th: Very unsettled with spells of rain and showers, very heavy at times with localised flooding. Windy at times with gales 22^nd. Temperatures varying between cool and very mild with lows crossing the UK; a few frosts, one hard one 18^th, minimum -5.2c.

27^th – 30^th: Turned cold but dry. Sunny at times, some hard frosts, coldest being -7.5c on the 29^th colder than any of the official weather stations in the UK even Scotland., with a maximum of just 1.8c

Total rainfall: 185.4mm
Wettest day: 31.3mm 22^nd

Rain days >0.2mm: 23
Wet days >1.0mm: 19
Days of heavy rain >10mm: 8
Mean temperature: 5.5c

Mean Max: 8.9c

Mean Min: 2.0c

High Max: 12.9c 13^th
Low Max: 1.8c 29th

High Min: 11.0c 13^th
Low Min: -7.5c 29th

Air frost: 12

Ground frost: 17

Mean RH: 90%

High RH: 100% various
Low RH: 65% 3^rd

Predominant wind directions: SSE
Mean wind speed: 1.7mph
Mean pressure: 1008mbar
Max pressure: 1026mbar 7^th
Min pressure: 974mbar 1^st

Days with:

Hail: 3
Gale: 1
Thunder: 0

Lightning only: 1
Fog: 4

Fog at 0900: 1

Snow or sleet: 2

Snow lying: 0

December 2012 Llanwnnen

Very wet with near normal temperatures

The wettest December since I began recording rainfall locally in 2003, and the wettest month of a soggy 2012! A cold and frosty first half was offset by a mild second half. No snow fell at all in December, and after 14^th there were no air frosts even.

1^st – 7^th: Rather cold and unsettled rain and showers, heavy at times with hail. Sunny intervals too, but some quite sharp frosts when skies cleared overnight, as low as -5c. However the 3^rd reached a mild 10c.

8^th – 13^th: Became very cold and mainly dry. Sunny periods with some hard frosts, lowest being -7.4c on the 11^th, temperatures barely making it above freezing on the 11^th and 13^th.

14^th - 31^st: A protracted dull and really wet spell: very unsettled with showers and longer spells of rain, heavy at times, windy at times. It rained on each day from the 13^th, and there were 11 days of 'heavy rain' that is having over 10mm. Not much sunshine during this period and with average to mild temperatures. Peak temperatures occurred on the 22^nd and 23^rd which both nudged above 12c, while the final night was the warmest with a low of just 9.2c

Total rainfall: 257.1mm

Wettest day: 27.3mm 22^nd

Rain days >0.2mm: 27
Wet days >1.0mm: 24
Days of heavy rain >10mm: 11
Mean temperature: 4.5c

Mean Max: 7.6c

Mean Min: 1.5c

High Max: 12.3c 22nd
Low Max: +0.6c 13^th
High Min: 9.2c 31^st
Low Min: -7.4c 11^th

Air frost: 15

Ground frost: 10

Mean RH:

High RH: 100% vs
Low RH: 75% 3rd

Predominant wind directions: South
Mean wind speed: 1.8mph
Mean pressure: 1007mbar
Max pressure: 1032mbar 11^th
Min pressure: 972mbar 14^th

Days with:

Hail: 4
Gale: 0
Thunder: 0
Fog: 3

Fog at 0900: 1

Snow or sleet: 0

Snow lying 0900: 0