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DECEMBER 2012 daily and monthly summary

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DECEMBER 2012
January 2013

December 2012 Monthly summary stats
‡ 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 less than 25% of total possible sunshine exposure this month due to low sun altitude and 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 2012
 
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
-2.9 4.7 3.4 89 1.8 0.2 1011.5 FS 0.3 0.6 8 SSW  Cloudy
2nd
-1.4 4.7 4.7 65 -1.4 1.7 1014.9 FS 0.3 0.6 11 SSW  Sunny
3rd
0.0 9.9 8.0 79 4.6 0.0 1005.5 RS 4.6 1.6 16 SSW  Rain
4th
2.3 7.1 7.1 66 1.1 0.8 1001.6 FS 0.0 1.8 16 SSW  Sunny periods
5th
-2.2 2.9 2.7 79 -0.6 0.2 1006.9 RS 0.5 1.4 14 N  Snow/sleet am
6th
-2.4 3.9 1.7 80 -1.4 0.2 1013.5 F 5.1 1.4 14 SW  Rain evening
7th
2.2 6.1 5.9 66 0.0 0.3 998.5 R 3.0 4.5 24 N  Rain am
8th
3.9 6.7 6.7 63 0.1 0.3 1023.3 ST 0.0 1.1 14 N  Sunny spells
9th
1.8 8.2 8.2 73 3.7 0.2 1014.6 F 0.0 2.8 17 N  Cloudy
10th
2.8 5.2 5.0 72 0.4 0.5 1020.8 RS 0.0 2.3 17 N  Sunny spells
11th
-1.2 3.7 3.7 71 -1.1 1.5 1027.7 FS 0.3 0.3 8 N  Sunny
12th
-5.4 -0.6 -0.7 90 -2.1 1.0 1017.2 F 0.0 0.0 2 NNW  Cloudy
13th
-3.7 1.7 1.6 88 -0.2 0.2 1001.9 F 0.3 0.0 5 E  Drizzle eve.
14th
0.8 11.1 10.2 92 8.9 0.0 974.4 FQ 10.9 4.4 25 SW  Rain
15th
7.9 9.9 8.9 85 6.6 0.5 992.2 RS 2.3 4.5 19 SW  Rain showers
16th
3.2 9.6 9.3 77 5.5 0.8 999.2 FS 2.0 1.3 13  Rain showers eve.
17th
5.9 9.3 9.1 73 4.5 1.3 1001.4 RS 0.0 2.3 13 SSW  Sunny
18th
3.8 8.1 8.1 77 4.3 1.2 1014.7 RS 0.0 0.7 10 N  Cloudy
19th
0.1 6.6 6.4 87 4.4 0.0 1015.2 FS 2.3 1.0 18 SE  Rain pm
20th
6.1 10.1 8.4 93 7.3 0.0 997.8 F 10.4 2.1 17 SE  Rain
21st
6.7 9.3 9.2 83 6.5 0.5 1009.7 RS 0.0 1.3 10 SSW  Cloudy
22nd
4.0 12.5 11.9 93 10.8 0.0 1000.2 F 14.0 3.5 21 SW  Rain
23rd
11.1 11.8 11.7 80 8.3 0.0 1003.4 RS 0.8 4.8 26 SW  Rain night am
24th
7.3 12.2 11.5 87 9.4 0.0 992.5 FQ 12.4 3.7 29 SW  Rain night pm
25th
7.0 9.2 8.9 83 6.2 0.1 991.8 R 6.6 3.8 22 SW  Rain
26th
4.3 10.3 10.2 84 7.6 0.1 1004.5 F 4.1 4.0 26 SW  Rain
27th
7.0 8.1 7.8 82 4.9 0.2 1000.3 R 4.1 3.8 25 SW  Rain
28th
5.4 11.7 11.3 91 9.9 0.0 1014.8 FS 2.8 4.7 25 SW  Rain
29th
10.7 11.3 10.8 85 8.4 0.0 998.1 F 3.8 6.6 27 SW  Rain
30th
5.2 10.0 9.4 71 4.4 0.2 1010.6 RS 0.0 5.8 26 SW  Cloudy
31st
8.9 11.4 10.4 88 8.5 0.0 999.2 F 6.6 7.1 31 SW  Rain
                         
‡ 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 65% 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 1006 hPa W of Denmark. Mainly cloudy day with some bright and sunny intervals and a brief spell of drizzle.
2nd
A sunny day with just some patches of cirrus cloud. Drizzle, perhaps sleety starts just before midnight.
3rd
Rain continues overnight ending around 06.30. A cloudy day with a rain shower, sky clears late in the day.
4th
A bright day with sunny spells.
5th
LP cells 998 hPa N Scotland and English Channel. Spell of snow around 08.30 gives a light dusting. Cloudy becoming brighter from midday.
6th
Thin mid level cloud giving some hazy sunshine for a while. Becoming overcast with light drizzle and rain from the evening.
7th
A spell of two hours rain in the morning clearing to give short sunny spells in the afternoon.
8th
HP 1031 hPa SW of Ireland. Cloud clears in the morning to give a sunny period before a cloudy spell early afternoon. Sky clears again later.
9th
Overcast early, mainly cloudy day with a sunny spell in the middle of the day.
10th
Cloudy first thing, becoming brighter. A mixture of cloudy and sunny spells.
11th
HP 1034 hPa N of Scotland. A light frost in the morning and a sunny and clear day. Precipitation from frostmelt.
12th
A hard frost, mainly cloudy but bright with a couple of spells of sunshine. First ice day at the site since 25th Dec 2010.
13th
A cloudy day with haze and a brief moment of weak sunshine. A little drizzle in late evening.
14th
LP 958 hPa SSW of Iceland with secondary LP over SW England moving NE. A dull day with rain from 09.30, sometimes quite heavy, lasting to mid afternoon. A further spell of showery rain in the evening.
15th
Mainly cloudy day with light rain showers and a few sunny intervals.
16th
Early cloud breaks after 10.00 to give a long sunny period through the middle part of the day. Cloudy later with rain showers in the evening.
17th
Early cloud breaks just before 09.00 to give long sunny periods.
18th
Mainly cloudy but often bright with a sunny spell during the middle of the day.
19th
An overcast and gloomy day with intermittent rain and drizzle after 13.30.
20th
Spells of rain and drizzle all through the night. morning and afternoon, easing off in the evening.
21st
A mainly cloudy day with some short sunny spells.
22nd
Huge LP S of Iceland at 976 hPa with numerous associated fronts and an enormous area of cloud over the Atlantic and W Europe. Moderate rain from around 04.00 gradually easing by 14.00 but remaining heavily overcast all day. Another band of rain passes over in early evening and night.
23rd
Light rain and drizzle in the early hours. A cloudy day with hints of brightness but becoming overcast again by evening.
24th
Light rain in the early hours, overcast and gloomy but dry in the morning. A spell of rain in early afternoon, sky clears a little by sunset. More rain later.
25th
LP 981 hPa N of Scotland. Heavy rain showers from cold front early morning becoming shorter and lighter after sunrise, then a band of showery rain from troughs in mid and late morning.
26th
A sunny start but becoming cloudy by mid morning. A spell of rain in the afternoon.
27th
Two spells of rain in the morning, the first brief but heavy. Cloudy afternoon but with a little brightness.
28th
An overcast and gloomy day with intermittent light rain and drizzle throughout.
29th
LP 947 hPa S Iceland. A bright start becoming cloudy with light rain through the middle of the day. Some rain showers in late evening.
30th
A sunny start becoming cloudy through late morning and the afternoon.
31st
Damp and dismal from daybreak with rain in the afternoon accompanied by strong winds.