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DECEMBER 2011 daily and monthly summary

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DECEMBER
January 2012

December 2011 Monthly Stats summary
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is limited. The sensor receives only up to 25% of total possible sunshine exposure this month due to obstruction. There is no allowance for sunshine by visual observation only, so the sunniest day figures above can be very significantly less than the actual daily sunshine duration.
THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature.
THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature.
EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall"


   DAILY STATS DECEMBER 2011
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
 WEATHER
 NOTES
DATE
Low
(21-09h)
High
(09-21h)
Temp at 14.00z
RH %
at 14.00z
Dewpoint ºc
at 14.00z
Bright
sun hrs
hPa   †
at 14.00z
Day Total
(mm)
Average
(mph)
Max Gust
(mph)
Dominant
(Compass)
 Precipitation
 type etc ‡
                       
1st
9.0 12.2 9.8 88 7.9 0.1 1006.0 FS 17.5 2.4 24 SW  Rain
2nd
3.0 7.6 6.7 84 4.2 0.3 1013.3 FS 0.5 1.8 17 SW  Rain night pm
3rd
5.6 11.7 11.2 62 4.2 1.7 1002.4 RS 2.5 4.1 24 SW  Rain am
4th
7.6 9.3 9.2 77 5.3 0.0 997.8 F 0.0 2.1 14 SSW  Cloudy
5th
2.9 6.7 6.2 68 0.7 0.2 1005.4 ST 0.0 2.3 18 SSW  Cloudy
6th
3.1 6.8 6.4 68 0.9 0.1 1007.1 ST 0.0 2.8 17 SSW  Cloudy
7th
6.0 8.9 8.5 50 -1.3 1.5 1007.9 R 0.3 4.0 20 SW  Sunny periods
8th
3.0 12.2 11.3 86 9.1 0.0 1005.7 FQ 2.5 5.5 30 SW  Rain am, eve
9th
4.0 7.9 7.8 59 0.3 1.8 1009.4 FS 0.0 2.4 19 SSW  Sunny
10th
-1.6 5.7 5.6 65 -0.5 1.5 1014.3 FS 0.0 0.5 10 SW  Sunny
11th
-1.2 8.7 7.9 78 4.3 0.0 1005.0 F 7.1 1.5 19 SW  Rain am, eve
12th
2.8 8.8 8.3 71 3.3 1.2 1004.9 FS 11.2 3.7 29 SW  Rain am, night pm
13th
6.7 11.7 7.4 59 -0.1 0.8 991.5 RS 8.9 6.2 31 SW  Rain am
14th
3.3 6.1 5.9 66 0.1 0.8 994.8 R 0.5 3.5 21 SW  Rain am
15th
4.3 7.9 7.6 69 2.3 0.8 999.2 RS 4.1 3.8 22 SW  Rain night pm
16th
1.6 3.9 3.6 81 0.7 1.2 987.3 R 5.8 2.6 17 N  Rain/sleet/snow am
17th
0.6 5.2 5.2 77 1.5 1.2 1007.1 FS 0.0 1.5 14 SSW  Sunny spells
18th
-0.1 5.0 4.9 75 0.8 0.2 1013.9 F 0.0 1.1 12 SSW  Cloudy
19th
-1.9 5.8 1.6 91 0.2 0.0 1011.8 F 4.1 0.5 11 SW  Rain pm/eve.
20th
5.3 7.7 7.2 70 2.1 0.1 1015.2 RS 0.5 1.4 16 WNW  Sunny am
21st
5.6 11.7 11.2 94 10.3 0.0 1016.3 RS 2.5 0.6 8 SSW  Rain am
22nd
8.6 11.9 11.8 78 8.1 1.3 1023.4 ST 0.0 1.8 13 WNW  Sunny
23rd
9.6 10.3 10.2 89 8.5 0.0 1011.6 FQ 4.3 5.0 21 SW  Rain
24th
3.1 7.7 7.6 73 3.0 1.5 1028.6 FS 0.3 2.8 17 SW  Sunny spells
25th
7.1 11.3 11.2 75 6.9 0.2 1027.2 ST 0.0 5.3 21 SW  Cloudy
26th
10.7 11.7 11.4 85 9.0 0.0 1032.5 ST 0.0 3.8 18 SW  Overcast
27th
9.4 10.3 10.3 72 5.5 0.0 1032.0 F 0.0 1.5 14 SSW  Overcast
28th
7.4 11.1 9.7 73 5.1 0.5 1017.7 FS 0.5 4.1 22 SW  Light rain
29th
4.9 9.2 7.9 82 5.1 0.0 1017.7 F 4.8 4.5 24 SW  Rain showers
30th
4.8 7.7 7.1 75 2.9 0.0 1017.0 F 5.3 1.3 13 SW  Rain pm/eve
31st
5.9 12.3 12.1 85 9.7 0.0 1008.8 FS 0.3 3.4 18 SW  Rain night pm
                         
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is rather limited. The sensor receives less than 25% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation only, so the figures above can be very significantly less than the actual daily sunshine duration.
† Barometer trend (previous 3 hours) : F = falling, ST = steady, R = rising; Q = quickly, S = slowly
Weather Notes use METAR codes: OVC = overcast; SHRA = rain showers; '+' = heavy; CAVOK = no cloud below 5000 ft & visibility> 10 km & no fog, precipitation or snow; SN = snow; RASN = Rain and snow

1st
LP 963 hPa between Faroe and Shetland Isles, HO from Spain to Balkans.
Light rain early in the night, rather heavy bursts around rush hour. Some brightness then more rain from mid-afternoon to past midnight.
2nd
Sunny morning, a sheet of cloud crosses during early afternoon. Another band of rain arrives around 23.00.
3rd
Light rain/drizzle early morning, showers around sunrise. Cloud clears to give sunny spells.
4th
A cloudy day, sometimes overcast and sometimes broken cloud with blue sky but no sunshine. A brief light rain shower early evening.
5th
A bright day but extensive medium level cloud allows sunny spells for the morning only.
6th
A cloudy day with a little brightness in the morning.
7th
A little light rain before dawn, a day of sunny periods with a couple of cloudy spells.
8th
LP 957 hPa Outer Hebrides, HP 1032 hPa Spain.
Light rain around rush hour, staying cloudy before cold front brings heavier rain during the evening.
9th
Sunny and clear in the morning, some cloud during the afternoon with sunny spells.
10th
Sunny and clear in the morning, some patchy high cloud from midday making the sunshine a little hazy.
11th
Light rain and drizzle for a couple of hours after dawn, a dry but dull spell followed by more drizzle and then rain from 17.30 to 22.00.
12th
A sunny day, clouding over after 15.00, light rain from 16.30 becoming moderate later continuing through the night.
13th
Strong winds and rain overnight, with downpour as cold front passes, clearing around 05.30. Sunny morning, some cloud patches pm.
14th
Some light rain early am, day is a mixture of sunny and cloudy spells.
15th
LP 988 hPa Lincolnshire moving E.
A sunny morning, increasing cloud from midday. Rain from just after 21.00 continuing overnight.
16th
LP 973 hPa deepening along the Channel over night into Belgium. Rain continuing overnight to the early hours. Further rain from 07.00 turns sleety with some snowflakes occasionally to midday. Light covering on North Downs, not settling in town. Sunny spells pm.
17th
Clear morning with ground frost. Sunshine followed by a cloudy period during midday with some brief light rain then sunny spells again.
18th
Clear morning with ground frost. Sunshine followed by a cloudy period after midday.
19th
Quite heavy ground frost, becoming overcast early with drizzle starting around 12.30 and rain persisting.
20th
Light rain shower before dawn. Sunny and clear start, becoming hazy around midday and cloudy soon after. Light rain late night.
21st
Light rain and drizzle on and off into the morning. Staying overcast all day.
22nd
High cloud and haze first thing becoming clearer with unbroken sunshine after 09.30.
23rd
A rather gloomy overcast day with intermittent drizzle from 08:30 followed by heavier rain as cold front passes late pm/evening.
24th
Some lengthy sunny spells athough a little hazy at times.

25th &
26th

HP 1042 hPa Central France/Switzerland/Austria.
Mainly overcast or cloudy with a little brightness pm.

27th
An overcast and rather dull day.
28th
LP 967 hPa NW of Outer Hebrides.
A trace of rain from drizzle as cold front crosses around 08.00 followed by a bright period. Spell of light rain around 13.00h.
29th
Overcast morning, brighter around midday followed by band of rain showers.
30th
Rather cloudy and dull, light rain late pm, heavier rain later for two hours in the evening.
31st
Mainly overcast with just a few brighter but brief glimpses of blue sky. Some light rain after 22.00h.