2015 detailed weather summaries Llanwnnen

2015 SUMMARIES LLANWNNEN

JAN

Near normal temperatures and slightly wet

Temperatures close to average, rainfall a little above average, a rather typical Winter month having a little snow, some strong winds and heavy rain at times, drier brighter intervals and a fair few frosty nights. Estimated sunshine at 49 hours would be also be near normal.

1^st : Very mild and windy with spells of rain, the minima of 8.8c the mildest of the month

2^nd – 6^th: Often dry, some sunny spells and a little light rain or drizzle at times. Near normal temperatures with night frosts turned milder.

7^th – 12^th: Unsettled and windy, spells of rain, some heavy, and only brief drier brighter intervals. Mild to very mild, 12.7c 9^th being the highest of the month.

13^th – 17^th: Often quite cold, spells of rain or wintry showers. Heavy snow on the morning of 13^th gave 3cm accumulation and there was thunder and lightning during the evening. With the snow cover it was a cold day maximum 2.3c. Briefly mild 14^th which saw a deep low cross the UK with heavy rain and strong to gale force winds, 28.2mm made it the wettest day of the month and there were gusts up to 61mph. Some sunny intervals, frosts most nights.

18^th – 22^nd: Cold but fairly dry, rather cloudy excepting 19^th which had an estimated 5 hours sunshine. Often frosty by night, -7.6c night of 18^th the lowest of the month, but only the coldest since 29^th December (-8.4c)

23^rd – 28^th: After a frost 23^rd became mild, and this spell was often rather mild with some rain at times, It turned colder again during 28^th

29^th – 31^st: Rather cold, windy and showery, some longer spells of rain and sleet, plenty of hail showers especially 31^st which gave a temporary covering.

Total rainfall: 174.7mm (123%)

Wettest day: 28.2mm 14^th

Rain days >0.2mm: 26
Wet days >1.0mm: 25
Days of heavy rain >10mm: 6Mean temperature: 4.5c

Mean Max: 7.3c

Mean Min: 1.7c

High Max: 12.7c 9^th
Low Max: 2.3c 13^th
High Min: 8.8c 1^st
Low Min: -7.6c 19^th

Est sun: 49hr

Max sun: 5 hours various dates

Days no sun: 7

Air frost: 12

Ground frost: 14

Ice day (max below 0c): 0

Max snow depth: 3cm 13^th

Mean RH: 91%

High RH: 100% vs
Low RH: 66% 2^nd

Predominant wind direction: WSW
Mean wind speed: 9.2mph

Max gust: 61mph 14^th Mean pressure: 1013mbar
Max pressure: 1036mbar 4^th
Min pressure: 975mbar 30^th

Days with:

Hail: 9 (2 > 5mm)
Gale: 0
Thunder: 1

Snow or sleet: 9

Snow lying 0900: 2
Fog: 0

Fog at 0900: 0

0900 WIND: N 1 NE 0 E 3 SE 1 S 3 SW 9 W 8 NW 2 C 4

February

Another average month

Temperatures were marginally below average and rainfall below average, while estimated sunshine at 78 hours was above average. A rather benign month, mostly dry and cold early on it became unsettled and often rather mild from mid month.

1^st – 11^th: Mostly dry, cold and frosty. A 1cm of snow 2^nd as a NW flow brought some wintry showers, this day also saw the coldest max of 2.4c. Thereafter pressure rose as an anticyclone became established over Ireland. Quite sunny 3^rd - 8^th then cloudy with some fog. Some sharp frosts, coldest being night of 2^nd -7.1c, also with -6.8c night of 6^th. Maxima mostly below 5c although 8.3c attained 8^th in the strong sunshine.

12^th – 19^th: Unsettled and quite windy at times, rain at times, especially the 18.3mm 13^th. Temperatures average to mild but still the odd slight frosts when clear spells permitted. A rather cloudy spell this, although 15^th and 17^th saw better sunny spells.

20^th – 28^th: Changeable with fluctuating temperatures between rather cold and mild. Occasional rain or showers and windy at times, also some decent sunny spells...The highest temperature reading of the month occurred 25^th 11.3c which was the mildest since 10^th January (11.7c).

Total rainfall: 78.5mm (75%)

Wettest day: 18.3mm 13^th

Max rain rate: 23mm/hr 16^th

Rain days >0.2mm: 17
Wet days >1.0mm: 12
Days of heavy rain >10mm: 3Mean temperature: 3.5c

Mean Max: 6.8c

Mean Min: +0.2c

High Max: 11.3c 25^th
Low Max: 2.4c 2^nd
High Min: 6.5c 19^th, 26^th
Low Min: -7.1c 3^rd

Estimated sun: 78 hour (120%)

Max sun: 8.5 hr 4^th

Days no sun: 4

Air frost: 13

Ground frost: 16

Ice day (max below 0c): 0

Mean RH: 89%

High RH: 100% various dates
Low RH: 61% 17^th

Predominant wind directions: WSW
Mean wind speed: 7.1mph

Max gust: WSW 42mph 23^rd Mean pressure: 1016mbar
Max pressure: 1042.5mbar 8^th
Min pressure: 986.9mbar 23^rd

Days with:

Hail: 7
Gale: 0
Thunder: 0

Snow or sleet: 2

Snow lying 0900: 1
Fog: 5

Fog at 0900: 2

0900 WIND: N 3 NE 1 E 1 SE 2 S 4 SW 4 W 4 NW 2 C 7

Winter 2014/15

An average Winter, lack of snow

Temperatures and rainfall very close to average with an absence of extremes. Estimated sunshine at 188 hours was slightly above average. December although the mildest month (mean 5.0c) managed both the lowest maximum 1.8c (4^th) and minimum -8.4c (29^th). Snow lay on just 3 mornings throughout the Winter with a maximum depth of only 3cm (13^th). The wettest month was January with 174.7mm, the wetter spells being interspersed with drier spells throughout Winter so that no real flooding occurred locally. Wettest day of Winter 28.2mm January 14^th . There were no true gales during the whole Winter, with by and large an absence of damaging winds, excepting January 14^th when gusts reached 61mph.

Total rainfall: 405.9mm

Wettest day: 28.2mm 14^th January
Rain days >0.2mm: 66
Wet days >1.0mm: 57
Days of heavy rain >10mm: 14Mean temperature: 4.3c

Mean Max: 7.3c

Mean Min: 1.2c

High Max: 12.7c January 9th
Low Max: 1.8c December 4th
High Min: 10.9c December 18th
Low Min: -8.4c December 29th

Est sun: 188hr

Max sun: 8.5 hr February 4^th

Days no sun: 18

Air frost: 36

Ground frost: 45

Ice day (max below 0c): 0

Mean RH: 91%

High RH: 100% various dates
Low RH: 61% January 17^th

Predominant wind directions: WSW
Mean wind speed: 7.8mph

Max gust: 61mph January 14^th Mean pressure: 1016.3mbar
Max pressure: 1042.7mbar December 29^th
Min pressure: 975.2mbar January 30^th

Days with:

Hail: 23
Gale: 0
Thunder: 1

Snow or sleet: 14

Snow lying 0900: 3

Max depth snow lying: 3cm January 13^th
Fog: 9

Fog at 0900: 2

0900 WIND: N 5 NE 2 E 4 SE 3 S 10 SW 20 W 21 NW 6 C 19

March 2015

Another very average month lacking in extremes; quite sunny

Another month lacking in extremes bar some cold nights. Highest maximum temperature just 12.6c (29^th) the lowest such value since March 2006. Rainfall ended up quite close to the average due to an unsettled final week. Estimated sunshine at 123 hours was above average.

1^st – 3^rd: Unsettled, sunny spells and showers with hail, rather cold with some frost

4^th – 7^th: High pressure close to UK, mostly dry, alternate cloudy and bright days, became rather mild and windy

8^th – 13^th: Unsettled and windy at times; occasional rain or drizzle. Temperatures mostly average to rather mild but with some frosty nights

14^th - 17^th : Mostly dry and anticyclonic, started off rather cold with night frost but became milder. Rather cloudy, although decent sunny spells 17^th.

18^th – 22^nd: High pressure close by UK, dry and often sunny/ clear - 19^th , 21^st and 22^nd all having almost unbroken sunshine. The clear skies and calm conditions permitted sharp frosts, this area having some of the lowest readings in the UK, the months coldest night being -5.0c 22^nd. Daytime temperatures recovered to above average.

23^rd – 31^st: Unsettled and often quite windy with rain or showers at times. Cool at first but became average to quite mild . Often cloudy but some brighter days of sunny intervals. 28^th the mildest day of the month was a poor 12.6c 28th being a mere 2c above the late March average.

Total rainfall: 72.6mm (87%)

Wettest day: 13.5mm 28^th

Max rain rate: 35.4mm/hr 1610 2^nd

Rain days >0.2mm: 17
Wet days >1.0mm: 14
Days of heavy rain >10mm: 2Mean temperature: 5.6c

Mean Max: 9.9c

Mean Min: 1.2c

High Max: 12.6c 28^th
Low Max: 6.6c 13^th
High Min: 7.9c 7^th
Low Min: -5.0c 22^nd

Est sun: 122.5hr (126%)

Max sun: 10.5 hours 19^th, 21^st, 22^nd

Days no sun: 3

Air frost: 17

Ground frost: 18

Mean RH: 86%

High RH: 100% various dates
Low RH: 49% 10th

Predominant wind directions: WSW
Mean wind speed: 6.9mph

Max gust: WSW 46mph 0903 29^th Mean pressure: 1021mbar
Max pressure: 1040mbar 5^th
Min pressure: 995mbar 29^th

Days with:

Hail: 7
Gale: 0
Thunder: 0

Snow or sleet: 1

Snow lying 0900: 0
Fog: 4

Fog at 0900: 2

0900 WIND: N 1 NE 4 E 3 SE 2 S 3 SW 6 W 2 NW 4 C 6

April 2015

Dry, rather warm and sunny

Prolonged spells of dry, pleasantly warm and sunny weather was the theme this month, almost an early taste of Summer at times, although still not as dry, warm and sunny as some other recent Aprils (2007, 2011). Apart from short cooler unsettled spells at the beginning and end there was little to interrupt the fine, anticyclonic conditions. The clear skies did mean that frost was quite a feature as the month recorded 10 air frosts and with one notably hard frost near the end of the month.

1^st – 3^rd: Mostly cloudy and quite cool with rain and drizzle on and off, 3^rd at max 9.3c was the coolest day of the month.

4^th – 10^th: Dry and soon warm with sunny periods with high pressure close to the UK. Several days saw unbroken sunshine with 8^th and 9^th reaching 19.6c. Nights however cold and clear with slight frosts.

11^th – 13^th: A cooler and quite windy blip with a little rain but some sunny spells still.

14^th – 23^rd: Dry and often warm with sunny periods. A prolonged Summer-like spell with no measurable rain, sunshine unbroken 4 out of the 5 days 18^th – 22^nd. Temperatures peaked at 21.1c 21^st which is very warm for April, the 22^nd and 23^rd also exceeded 20c. The clear skies led to slight overnight frosts particularly 19^th – 23^rd.

24^th – 26^th: Cooler and cloudier but still mostly dry. Temperatures falling below average by 26^th which was though a sunny day.

27^th – 30^th: Cool and rather unsettled: -5.0c dawn 27^th was the coldest temperature I have recorded this far into April or Spring (I recorded -3.7c 5^th May 1996 using a max/min thermometer at a nearby site). The month ended on a cooler note with some rain and showers but still decent sunny spells as well. Just a hint of sleet in the showers 27^th, while a frontal system overnight 28^th gave 7.6mm rain – the wettest day of the month.

Total rainfall: 29.5mm 39%

Wettest day: 7.6mm 28^th

Max rain rate: 21.2mm/ hour 11^th

Rain days >0.2mm: 9
Wet days >1.0mm: 7
Days of heavy rain >10mm: 0Mean temperature: 8.8c

Mean Max: 15.3c

Mean Min: 2.3c

High Max: 21.1c 21^st
Low Max: 9.3c 3^rd
High Min: 9.3c 25^th
Low Min: -5.0c 27^th

Est sun: 218hr (144%)

Max sun: 13 hours 18^th, 20^th, 22^nd

Days no sun: 1

Air frost: 10

Ground frost: 17

Mean RH: 79%

High RH: 100% vs
Low RH: 35% 22^nd

Predominant wind directions: West
Mean wind speed: 6.3mph

Max gust: 40mph 12^th Mean pressure: 1022mbar
Max pressure: 1038mbar 7^th
Min pressure: 1004mbar 25^th

Days with:

Hail: 1
Gale: 0
Thunder: 0

Snow or sleet: 1

Snow lying 0900: 0
Fog: 2

Fog at 0900: 0

0900 WIND: N 3 NE 6 E 5 SE 1 S 1 SW 2 W 7 NW 2 C 3

May 2015

Cool, breezy and changeable; quite dull and rather wet

An uninspiring May offering little early warmth of note while not sparing us a relapse back into Winter (no air frosts).

1^st – 8^th: Dull and unsettled with rain and strong winds at times. Limited sunshine for the start of May with rain or showers each day, although rarely heavy. Some deep lows over the UK during 3^rd and 5^th/ 6^th with gusts to 52mph 5^th. Temperatures mostly rather cool.

9^th – 17^th: A drier and brighter spell and warmer at times too, just a little rain at times. Some days still on the cool side but the 13^th managed 19.3c with plentiful sunshine, the breeze was still nagging however during much of this mid month period.

18^th /19^th: Heavy rain cleared to sunny intervals and a few brief showers, a cool and fairly windy couple of days

20^th – 23^rd: Often dry and sunny (an estimated 11.5 hours 21^st and 23^rd) with improving temperatures, 20.3c the garden high 22^nd

24^th – 28^th: Mostly dry with sunny intervals but quite cool NW breezes. A little rain late 27^th.

29^th – 31^st: Unsettled, rain at times and often cool and breezy, some sunny intervals too.

Total rainfall: 95.7mm 124%

Wettest day: 17.0mm 17^th

Max rain rate: 26.6mm 29^th

Rain days >0.2mm: 22
Wet days >1.0mm: 18
Days of heavy rain >10mm: 3Mean temperature: 10.2c

Mean Max: 14.6c

Mean Min: 5.9c

High Max: 20.3c 23^rd
Low Max: 11.6c 8^th, 19^th
High Min: 11.3c 11^th
Low Min: 1.0c 1^st

Est sun: 150hr

Max sun: 11.5hrs 21^st, 23^rd

Days no sun: 0

Air frost: 0

Ground frost: 4

Mean RH: 82%

High RH: 100% various
Low RH: 42% 1^st

Predominant wind direction: SW
Mean wind speed: 7.6mph

Max gust: 52mph 5^th Mean pressure: 1014mbar
Max pressure: 1029mbar 16^th
Min pressure: 984mbar 5^th

Days with:

Hail: 3
Gale: 0
Thunder: 0

Snow or sleet: 0

Snow lying 0900: 0
Fog: 1

Fog at 0900: 0

0900 WIND: N 1 NE 1 E 4 SE 0 S 2 SW 9 W 7 NW 7 C 0

Spring 2015

Fairly sunny and quite dry, near normal temperatures

A dry, warm and sunny April ensured Spring ended up with close to average temperatures, above average sunshine and below average rainfall, even though May was disappointingly cool and cloudy. No marked extremes this Spring although late April did see one damaging frost of -5.0c. There was no snow and no thunder so rather uninteresting a Season, especially as May failed to deliver a warm spell of note. The highest temperature somewhat unusually being in April (21.1c on 21^st). The suppressed rainfall meant that at least flooding was not an issue and the ground was often pleasantly dry for field walking. Estimated sunshine from 5 minute webcam captures 490 hours (112%).

Total rainfall: 197.8mm 83%

Wettest day: 17.0mm May 17^th

Max rain rate: 35.4mm/hr 1610 March 2^nd

Rain days >0.2mm: 48
Wet days >1.0mm: 39
Days of heavy rain >10mm: 5Mean temperature: 8.2c

Mean Max: 13.3c

Mean Min: 3.1c

High Max: 21.1c April 21^st
Low Max: 6.6c March 13^th
High Min: 11.3c May 11^th
Low Min: -5.0c March 22^nd & April 27^th

Est sun: 490hr (112%)

Max sun: 13 hours 18^th, 20^th, April 22^nd

Days no sun: 4

Air frost: 27

Ground frost: 39

Ice day (max below 0c): 0

Mean RH: 82%

High RH: 100% various
Low RH: 35% April 22^nd

Predominant wind directions: WSW
Mean wind speed: 7.0mph

Max gust: 52mph May 5^th Mean pressure: 1019mbar
Max pressure: 1040mbar March 5^th
Min pressure: 984mbar May 5^th

Days with:

Hail: 11
Gale: 0
Thunder: 0

Snow or sleet: 2

Snow lying 0900: 0
Fog: 7

Fog at 0900: 2

0900 WIND: N 5 NE 11 E 12 SE 3 S 6 SW 17 W 16 NW 13 C 9

June 2015

Rather dry and quite sunny with average temperatures

Often on the cool side this start to Summer but with several short warm spells it was prevented from being below average by warmer weather in the final week which culminated in the hottest June day here in the 10 years record. A dry month after the 1^st which had 27.6mm which was half the monthly total.

1^st – 2^nd: Very cool wet and windy, it was the wettest June day since 2012 (3.2mm 7^th) with winds reaching 45mph 1^st.

3^rd – 8^th: Mostly dry and sunny but often quite cool apart from 4^th (21.6c). Quite an intense high developed over the UK and Ireland the barometer at 1037mbar 8^th. Virtually unbroken sunshine 7^th and 8^th but the cool breeze off Cardigan Bay restricted temperatures to just 15c. Notably cold on several nights, -1.0c and a rare June air frost first thing 8^th was the lowest I have recorded anywhere in June!

9^th – 12^th: Dry and warm but became cloudier. More unbroken sunshine 9^th gave an estimated 15 hours. Sunny intervals but a warm max of 23.9c 11^th.

13^th: After a very mild night (min 13.0c) it was cool and cloudy with rain at times

14^th – 25^th: Mostly dry with rather variable temperatures and sunny intervals. A few days saw a little rain but an essentially dry spell, sometimes cool, sometimes rather warm, variable cloud but most days saw some decent sunny intervals. Often quite breezy.

25^th -28^th: A little rain at times but also some sunny intervals which made it fairly warm if breezy.

29^th/ 30^th: A dry end to June with a remarkably hot 28.8c and near unbroken sunshine as the finale!

Total rainfall: 52.9mm 79%

Wettest day: 27.6mm 1^st

Max rain rate: 14.4mm/ hr 26^th

Rain days >0.2mm: 11
Wet days >1.0mm: 7
Days of heavy rain >10mm: 2Mean temperature: 13.3c

Mean Max: 19.0c

Mean Min: 7.6c

High Max: 28.8c 30^th
Low Max: 11.7c 1^st
High Min: 15.9c 30^th
Low Min: -1.0c 8^th

Est sun: 203 hr (125%)

Max sun: 15 hours 10^th

Days no sun: 0

Air frost: 1

Ground frost: 3

Mean RH: 80%

High RH: 100% vs
Low RH: 41% 10^th

Predominant wind directions: WSW
Mean wind speed: 5.7mph

Max gust: 45mph 1^st Mean pressure: 1020mbar
Max pressure: 1037mbar 8^th
Min pressure: 997mbar 2^nd

Days with:

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

Fog at 0900: 0

0900 WIND: N 3 NE 2 E 3 SE 0 S 3 SW 10 W 6 NW 3 C 0

July 2015: Changeable and dull, very cool late on; near average rainfall

Overall July ended up the coolest since 2012 (14.8c) although mean maxima were the least since 2008 (18.7c). The final week or so would probably be comparable with some of the coolest July spells in the historical record, being thoroughly cool and Autumnal. Rainfall was close to average with a high frequency of rain days (25). Sunshine estimated at 144 hours (80%). Remarkably cool penultimate night (0.7c) with a ground frost.

1^st – 4^rd: The brief heatwave of the last day of June continued a while into July, 27.7c reached 1^st in spite of a lot of cloud, there was some thunder late afternoon. Much cooler 2^nd but then another warm day with a little thunder once more in the evening and overnight, so that 3 out of the first 4 days heard thunder. Small amounts of rain occasionally during this opening period of the month.

5^th – 14^th: Unsettled and often breezy with rain at times and rather variable temperatures (mostly average to cool though). Often rather cloudy but with some dry bright days (especially 9^th/ 10^th the latter reached 24.1c). 13.0mm fell early 12^th (credited to 11^th rain day) this the wettest day of the month.

15^th – 22^nd: Sunny but rather cool 15^th, thereafter rain fell on most days but only in small amounts. Variable and sometimes large amounts of cloud but quite sunny 18^th/ 19^th. Often breezy with temperatures near or a little below average.

23^rd – 29^th: Very cool and unsettled with occasional rain or showers, rather cloudy and breezy. Notably low maxima at times, none more than the 14.8c of 27^th which is the lowest maximum I have recorded so far into July in the 10 year record, although for July itself the lowest remains 13.7c (2/7/12). No day 24^th - 29^th exceeded 18c which is almost unprecedented during 'High Summer'. With all, the cloud nights for the most part did hold up above 10c. Only an estimated 17 hours sunshine for the 8 days 20^th - 27^th.

30^th/31^st: A dry fine end to the month. Dawn 31^st produced a ground frost and minimum of +0.7c, the lowest in my 10 year record here (2.9c 2/7/11). Temperatures recovered to near average during the final day with pleasant sunny spells.

Total rainfall: 96.6mm (95%)

Wettest day: 13.0mm 11^th

Max rain rate: 43.4mm/hr 1328 5^th

Rain days >0.2mm: 25
Wet days >1.0mm: 21
Days of heavy rain >10mm: 1Mean temperature: 14.9c

Mean Max: 19.2c

Mean Min: 10.7c

High Max: 27.7c 1^st
Low Max: 14.8c 27^th

Min: 17.3c 1^st Low Min: +0.7c 31st

Est sun: 144 hrs (80%)

Max sun: 12 hr 15^th

Days no sun: 1

Air frost: 0

Ground frost: 1

Mean RH: 83%

High RH: 100% various
Low RH: 48% 10th

Predominant wind direction: SW
Mean wind speed: 6.3mph

Max gust: 29mph 6^th Mean pressure: 1014mbar
Max pressure: 1025mbar 3^rd
Min pressure: 995mbar 26^th

Days with:

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

Fog at 0900: 0

0900 WIND: N 2 NE 1 E 0 SE 3 S 6 SW 8 W 6 NW 5 C 0

August 2015

Rather cool, dull and unsettled

Not as cool as last August (14.0c) although mean minimum at 9.5c equalled last year. Rainfall was bang on average and drier than August 2014 (143.4mm). Quite an interesting feature was that fog was recorded on 8 mornings but on each one had thinned by 0900 GMT. No thunder or hail, no frost. Estimated sunshine at 131 hours just 80% of that estimated from the Met Office avreage maps.

1^st – 18^th: Changeable and quite cloudy with some rain at times but also some decent dry, bright interludes, rainfall amounts only small (wettest day 6.1mm 5^th). Temperatures variable but often on the cool side, coolest max 15.3c 14^th, while few days were warm (max 24.4c 12^th with an estimated 11 hours sunshine). It was rather windy during the first few days in particular. 14^th - 17^th saw a run of unusually cool nights for August, all 4 nights falling below 7c (lowest 2.4c 16^th).

19^th – 31^st: Unsettled and rather cloudy with rain or showers at times, some heavy. Over 33mm fell over the weekend 22^nd/ 23^rd as a low moved north across Wales. Temperatures mostly average or cool with some mild nights (min 16.6c 21^st) and the afternoon of 22^nd brightened between rain areas and was rather warm and humid (max 22.4c).

Total rainfall: 108.5mm 100%

Wettest day: 21.8mm 22^nd

Max rain rate: 61.2mm/ hr 23^rd

Rain days >0.2mm: 23
Wet days >1.0mm: 17
Days of heavy rain >10mm: 3Mean temperature: 14.4c

Mean Max: 19.3c

Mean Min: 9.5c

High Max: 24.4c 12^th
Low Max: 15.3c 14^th
High Min: 16.6c 21^st
Low Min: 2.4c 16^th

Est sun: 131hr 80%

Max sun: 11 hours 12^th

Days no sun: 1

Air frost: 0

Ground frost: 0

Mean RH: 87%

High RH: 100% vs
Low RH: 45% 8^th

Predominant wind directions: SSW
Mean wind speed: 5.2mph

Max gust: 33mph 2ndMean pressure: 1014mbar
Max pressure: 1025mbar 12th
Min pressure: 998mbar 26^th

Days with:

Hail: 0
Gale: 0
Thunder: 0
Fog: 8

Fog at 0900: 0

0900 WIND: N 2 NE 3 E 2 SE 2 S 12 SW 6 W 2 NW 1 C 1

Summer 2015

Fine dry June then mostly cool and changeable

July and August disappointed after a fine dry and quite sunny June. The months of High Summer being rather cool and dull with rain at times although no month was wet and Summer overall had slightly below average rainfall. It was marginally the coolest Summer in my 9 year record (next lowest 2011 14.3c)

Total rainfall: 258.0mm 92%

Wettest day: 27.6mm June 1^st

Max rain rate: 61.2mm/ hour June23rd

Rain days >0.2mm: 59
Wet days >1.0mm: 45
Days of heavy rain >10mm: 6Mean temperature: 14.2c (-0.8c)

Mean Max: 19.1c

Mean Min: 9.2c

High Max: 28.8c June 30^th
Low Max: 11.7c June 1^st
High Min: 17.3c June 1^st
Low Min: -1.0c June 8^th

Est sun: 478hr 94%

Max sun: 15 hrs June 10^th

Days no sun: 2

Air frost: 1

Ground frost: 4

Mean RH: 84%

High RH: 100% vs
Low RH: 41% June 19^th

Predominant wind directions: SW
Mean wind speed: 5.7mph

Max gust: 45mph June 1^st Mean pressure: 1016mbar
Max pressure: 1037mbar June 8^th
Min pressure: 995mbar July 26^th

Days with:

Hail: 0
Gale: 0
Thunder: 4
Fog: 9

Fog at 0900: 0

0900 WIND: N 7 NE 6 E 5 SE 5 S 21 SW 24 W 14 NW 9 C 1

September 2015

Rather cool and changeable; rather warm sunny end

Cool conditions predominated again this month, although at least maxima made a recovery in the final week. It was the equal coolest September with 2012 (11.8c) with a mean minimum of 6.6c being the coolest in my record (only since 2006). In spite of the often rather cloudy weather of the first 3 weeks or so, the late burst of sun meant it ended up quite a sunny September with an estimated 158 hours, while rainfall was rather below average.

1^st – 5^th: Cool and changeable; occasional showers, a few sunny intervals. Supressed temperatures to greet September continuing the cool theme of August, particularly cool 2^nd max just 13.8c. Rainfall quantities from showers were rather small.

6^th – 11^th: High pressure crossed northern UK. Dry and became rather warm with sunny spells; 8^th and 10^th both saw plentiful sunshine (estimated 12 hours 8^th). Chilly nights, min 1.4c 8^th and there most likely was a ground frost. Temperatures peaked for the month at a rather lowly 22.1c 10^th.

12^th – 20^th: Changeable with some showers and longer spells of rain, heavy at times, but drier spells as well. 19.2mm fell early 12^th (thrown back to 11^th), this spell did however see quite a lot of mostly dry weather, with much of the rain coming in heavy showers as with 18^th and 22^nd . Wales missed the rain 16^th in spite of pressure down to 990mbar and a deep low over the Channel, in fact apart from downpours during the early hours of the 18^th the 16^th to 20^th was largely dry with some sunny intervals. Fog formed on many nights during this quieter interlude. Temperatures varied between cool and rather warm.

21^st – 24^th: Cool and unsettled, heavy showers and some longer spells of rain. The mildest night of the month (11.8c 21^st) followed within 36 hours by the lowest maximum (13.3c 22^nd).

25^th – 30^th: Dry and mostly warm and sunny, a couple of night frosts early in the spell: A welcome fine sunny end to what had been an uninspiring September! The Season's first air frost first thing 26^th with a minimum of -0.4c making Llanwnnen unofficially the UK cold spot. Temperatures peaked at 19.8c 28^th. The very sunny end to the month transformed it into a rather sunny September total-wise. (an estimated 50 hours in the last 5 days).

Total rainfall: 93.9mm (87%)

Wettest day: 19.2mm 11^th

Max rain rate: 69.8mm/ hr 12^th

Rain days >0.2mm: 13
Wet days >1.0mm: 11
Days of heavy rain >10mm: 4Mean temperature: 11.8c (coolest since 2012 when also 11.8c)

Mean Max: 17.1c

Mean Min: 6.6c (coolest SRB 2006)

High Max: 22.1c 10^th
Low Max: 13.3c 22nd
High Min: 11.8c 21st
Low Min: -0.4c 26th

Est sun: 158 hr 127%

Max sun: 12 hours 8^th

Days no sun: 0

Air frost: 1

Ground frost: 4

Mean RH: 87%

High RH: 100% various dates
Low RH: 53% 26^th

Predominant wind directions: NNW
Mean wind speed: 4.3mph

Max gust: 23mph 4^th Mean pressure: 1017.4mbar
Max pressure: 1036.1mbar 28^th
Min pressure: 988.8mbar 14^th

Days with:

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

Fog at 0900: 1

0900 WIND: N 4 NE 2 E 3 SE 6 S 2 SW 3 W 3 NW 4 C 3

October 2015

Dry and quite sunny; near average temperatures

The driest October since 2007 (45mm), rainfall being just 50% of average and with just 14 rain days. A rather sunny month, the estimated total 107 hours (117%), this due to a sunny first half with only 36 hours second half. Temperatures close to average overall, however the mean minima of 5.1c was marginally the lowest I have recorded (5.3c 2010).

1^st – 4^th: A dry mild start to the month with sunny periods although more cloud and lower temperatures 3^rd/ 4^th. There were some frosts by night. The dry spell of late September ended in the early hours of 5^th after 9 successive dry days.

5^th - 7^th: Unsettled with variable temperatures; showers and some longer spells of rain, some very heavy and this a rather cloudy interlude. Mild nights, rather windy at times.

8^th - 20^th: A prolonged dry spell with high pressure over or close to the UK; sunny spells with temperatures by day mostly average to quite mild but with quite a few slight overnight frosts, lowest -1.3c 15^th. This dry spell lasted 12 days making it the most prolonged of 2015 (previous 11 days April).

21^st – 29^th: Often mild, rather unsettled with some rain at times: Even in its latter stages October did not revert to full blown Autumnal conditions, as although rather unsettled, rainfall amounts were modest and it was often mild. Min 11.9c 27^th being equal mildest of the month, indeed the mildest night since August 26^th. More cloudy than than the first 3 weeks but still with some sunny intervals most days and it was quite windy at times. Several days were dry or at least largely dry.

30^th/ 31^st: Very mild, a little rain with some sunny intervals. The month ended with warm winds arriving from North Africa, the minimum 31^st was 11.9c and maximum 17.1c, this though well below that of Halloween 2014 which managed an exceptional 19.4c - but then November 1^st happened!

Total rainfall: 71.1mm (50%)

Wettest day: 18.5mm 6^th

Max rain rate: 74.4mm/ hour 29th

Rain days >0.2mm: 14
Wet days >1.0mm: 11
Days of heavy rain >10mm: 2

Longest dry spell: 12 days Oct 8^th - 19^th inclusive
Mean temperature: 10.0c

Mean Max: 15.0c

Mean Min: 5.1c

High Max: 19.1c 1^st
Low Max: 11.6c 17^th
High Min: 11.9c 27^th /29th
Low Min: -1.3c 15^th

Est sun: 107hr (117%)

Max sun: 10 hours 1^st

Days no sun: 1

Air frost: 5

Ground frost: 9

Mean RH: 90%

High RH: 100% various
Low RH: 57%

Predominant wind directions: SSE
Mean wind speed: 4.1mph

Max gust: 32mph 5thMean pressure: 1019mbar
Max pressure: 1033.6mbar 1^st
Min pressure: 993.3mbar 6^th

Days with:

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

Fog at 0900: 4

0900 WIND: N 1 NE 3 E 4 SE 4 S 5 SW 0 W 4 NW 2 C 8

November 2015

Very mild, very dull and very wet

Mildest November since 2011 (10.4c) with mean minima the highest in my 10 year record (2011 5.9c) and was appreciably higher than October's (5.1c). The 13.4c min 10^th was the highest of the Autumn and just 2 air frost although one was quite hard (-6.1c 23^rd). Very wet with 27 wet days and 10 days of heavy rain (over 10mm) however well below the total of Nov 2009 (309.4mm) which is the wettest month I have recorded. Very dull, this remarkably in spite of the first 2 days being very sunny, 16 hours on 1^st and 2^nd of an estimated 38 hours in total for the month.

1^st/ 2^nd: Record breaking November warmth for the UK affected West Wales as temperature records were smashed! Both days were warm and sunny more akin to early September, we were several degrees below the 22.4c recorded at Trawsgoed 17 miles to our north but still managed a remarkable 19.9c on the 1^st followed the next day by maximum 19.2c. Some fog by night and first thing.

3^rd – 19^th: Much cooler by day although still mostly mild or very mild. Unsettled with rain at times, some heavy. This was a very dull spell, only an estimated 11 hours sunshine during these 16 days with 7 out of the 10 days between 8^th and 17^th sunless. Apart from a ground frost 3^rd this was a frost-free period which is unusually lengthy for November. It rained each day during this spell and all were 'wet days' getting over 1.0mm. Some exceptionally mild nights occurred as warm sectors moved through, none more than minimum 13.4c on 10^th which may well be a November record with 12.9c on 15^th only marginally lower. Rain although heavy at times never mounted up enough for flooding locally, the wettest day being a modest 21.7mm 6^th. It was often windy 6^th onwards

20^th – 23^rd: A brief cold snap which nonetheless produced some snow showers and a hard frost. Plentiful wintry showers through 21^st into 22^nd which although not settling did form an icy layer on the latter, also with one rather loud rumble of thunder in the early hours of 21^st. Dry and bright by day 22^nd then first air frost of the month was a hard one min -6.1c.

24^th – 30^th: Unsettled, very dull and often windy. Frequent spells of rain or showers, heavy at times becoming more prevalent towards the month end. Hardly any glimpses of the sun, with an estimated 1 hour in these final 7 days of November, it was one of the dullest spells I can recall. Mostly mild or very mild excepting 28^th which was average. 30^th was wet and windy and the months the wettest day with 25.6mm.

Total rainfall: 238.9mm 160%

Wettest day: 25.6mm 30^th

Max rain rate: 129.4mm/hr 1413 18^th

Rain days >0.2mm: 27
Wet days >1.0mm: 27
Days of heavy rain >10mm: 10Mean temperature: 9.3c

Mean Max: 12.2c

Mean Min: 6.4c

High Max: 19.9c 1^st
Low Max: 5.7c 21^st
High Min: 13.4c 10th
Low Min: -6.1c 23^rd

Est sun: 38 hr 70%

Max sun: 8 hrs 2^nd

Days no sun: 11

Air frost: 2

Ground frost: 4

Mean RH: 93%

High RH: 100% various
Low RH: 56% 2^nd

Predominant wind directions: WSW
Mean wind speed: 7.6mph

Max gust: 50mph 29^th Mean pressure: 1014mbar
Max pressure: 1028.5mbar 1^st
Min pressure: 996.5mbar 17^th

Days with:

Hail: 3
Gale: 0
Thunder: 1
Fog: 2

Fog at 0900: 1

Snow or sleet falling: 3

Snow lying: 0

0900 WIND: N 1 NE 0 E 0 SE 1 S 5 SW 12 W 4 NW 2 C 5

Autumn 2015

Near normal temperature and rainfall, slightly sunny

A cool September and very mild November so the Season worked out close to average temperature wise. Lack of frost, unusually October saw the most frost having 5 of the Season's 8 air frost. Remarkably the highest minimum was recorded in November (13.4c 10^th)! In spite of the very wet November the rainfall total was very close to average (thanks to the dry October). It was the wettest November since 2009 (309.4mm) with 27 wet days and 10 days over 10mm. Estimated sunshine (using 5 minute webcam image captures) at 303 hours was 112% of the average itself estimated from the Met Office maps.

Total rainfall: 403.9mm (103%)

Wettest day: 25.6mm Nov 30^th

Max rain rate: 129mm/ hr Nov 18^th

Rain days >0.2mm: 54
Wet days >1.0mm: 49 (27 Nov)
Days of heavy rain >10mm: 16 (10 Nov)Mean temperature: 10.4c

Mean Max: 14.7c

Mean Min: 6.0c

High Max: 22.1c Sept 10^th
Low Max: 5.7c Nov 21^st
High Min: 13.4c Nov 10^th
Low Min: -6.1c Nov 23^rd

Est sun: 303hr 112%

Max sun: 12 hrs Sept 8^th

Days no sun: 12 (11 Nov)

Air frost: 8 (Oct 5)

Ground frost: 17

Mean RH: 90%

High RH: 100% numerous
Low RH: 53% Sept 26^th

Mean wind speed: 5.8mph

Max gust: 50mph Nov 29^th Mean pressure: 1016.7mbar
Max pressure: 1036mbar Sept 8^th
Min pressure: 989mbar Sept 14^th

Days with:

Hail: 3
Gale: 0
Thunder: 1
Fog: 11

Fog at 0900: 5

0900 WIND: N 6 NE 5 E 7 SE 11 S 12 SW 15 W 11 NW 8 C 16

December 2015

Remarkably mild and exceptionally wet; dull and windy

Just about the most astounding month I have experienced for temperatures to have such a departure from average on a consistent basis. The overall mean at 9.3c was about 5c above average and more like a typical April or October, in fact we have had cooler May's than this December! November 2015 was a very mild month and yet December managed to equal that month figure. A truly astounding month not only for temperature but also in the end for rainfall as well as the month seems to have become the second wettest of any month in the local historical record back to the nineteenth century (January 1974 381mm).

Some of the more remarkable stats:

Mean maxima almost 5c above average

Mildest December night record broken 3 times

Highest December temperature record broken twice

Only 1 air frost, lowest temperature -0.2c

27 days exceeded 10c

13 days exceeded 12c (in a typical December this might happen once)

Wettest December and second wettest of any month locally

31 rain days, 14 days over 10mm, 5 days above 20mm

17 sunless days

1^st – 6^th: very mild and sunless, unsettled and windy. Rain or showers, heavy at times, some mainly dry days. Very windy 5^th with gusts to 57mph.

7^th/ 8^th: sunny spells with some rain or showers at times. Exceptionally mild 7^th max 13.9c being my mildest December temperature in 12 year record. Windy.

9^th – 11^th: slight air frost 9^th which was a mostly dry and mild day. Otherwise near normal maxima with rain at times and a few sunny intervals, less windy.

12^th – 14^th: dull and mild with rain at times, heavy 12^th.

15^th – 19^th: exceptionally mild; dull with spells of rain, windy at times. An unprecedented mild spell for December, all maxima above 12.9c, and all minima 16^th - 19^th above 10.8c. My highest December minimum of 11.8c occurred on the 17^th while temperatures peaked at 13.9c in the early hours of the 19^th. Very wet also 19^th with 42mm midnight to midnight and 30.7mm 0900 -0900 making it the wettest day of the year.

20^th – 31^st: Very mild and very unsettled, periods of wet and windy weather. For the most part it remained unseasonably mild, with most days exceeding 10c. Specially mild around Christmas with the temperature remaining above 12c overnight 25^th once more breaking the record for the third time this month. Frequent rain or showers although a few days were mainly dry. The wettest weather was 29^th/ 30^th when over 50mm fell on these 2 days. Often windy with gales at times, the final 3 days of the month all saw gusts above 50mph. Thunder occurred 31^st with one close flash of lightning.

Total rainfall: 340.3mm 236%

Wettest day: 33.6mm 29^th

Rain days >0.2mm: 31
Wet days >1.0mm: 27
Days of heavy rain >10mm: 14Mean temperature: 9.3c

Mean max: 11.3c

Mean min: 7.2c

High max: 13.9c 7^th and 18^th
Low max: 6.9c 24^th
High min: 12.1c 26^th
Low mn: -0.2c 9^th

Est sun: 24 hr 63%

Max sun: 4.5 hr

Days no sun: 17

Air frost: 1

Ground frost: 3

Mean RH: 93%

High RH: 100% various
Low RH: 73% 8^th

Predominant wind directions: SSW
Mean wind speed: 11.9mph

Max gust: 57mph 5^th Mean pressure: 1014mbar
Max pressure: 1030.5mbar 9^th
Min pressure: 998.9mbar 30^th

Days with:

Hail: 3
Gale: 0
Thunder: 1

Sleet or snow falling: 0

Snow lying: 0
Fog: 0

Fog at 0900: 0

0900 WIND: N 0 NE 1 E 1 SE 3 S 5 SW 16 W 5 NW 0 C 0

2015 summary:

Total rainfall: 1453mm 110%

Wettest day: 33.6mm Dec 29^th

Max rain rate: 129mm/ hr Nov 18th

Rain days >0.2mm: 235
Wet days >1.0mm: 197
Days of heavy rain >10mm: 49Mean temperature: 9.6c

Mean Max: 13.9c

Mean Min: 5.4c

High Max: 28.8c June 30^th
Low Max: 2.1c Jan 19^th
High Min: 17.3c July 1^st
Low Min: -7.6c Jan 19^th

Est sun: 1423 hr 104%

Max sun: 15 hr June 10^th

Days no sun: 46

Air frost: 62

Ground frost: 94

Mean RH: 86.7%

High RH: 100% numerous
Low RH: 35% Apr 22^nd

Predominant wind directions: SW
Mean wind speed: 7.0mph

Max gust: 61mph Jan 14^th Mean pressure: 1016.6mbar
Max pressure: 1042.5mbar Feb 8^th
Min pressure: 977.2mbar Jan 30^th

Days with:

Hail: 33
Gale: 0
Thunder: 6

Sleet or snow: 16

Snow lying: 3
Fog: 32

Fog at 0900: 9

0900 WIND: N 22 NE 24 E 29 SE 25 S 51 SW 85 W 58 NW 34 C 37