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DECEMBER 2013 daily and monthly summary

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DECEMBER 2013
January 2014

December 2013 data summary to 15th
* Compared to site averages 1985 - 2012.
‡ SUN:
These sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is extremely limted this month. The sensor receives less than 25% of total possible sunshine exposure this month due to building obstruction and low sun altitude. There is no allowance above 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 2013
 
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
1.3 8.3 8.1 82 5.2 0.3 1031.7 ST 0.0 0.3 6 N  Cloudy
2nd
6.0 8.7 8.7 78 5.0 0.0 1031.8 FS 0.0 0.0 3 NNW  Overcast
3rd
4.3 6.8 6.8 75 2.7 0.0 1027.6 FS 0.0 0.2 6 N  Overcast
4th
4.8 8.9 8.7 72 3.9 0.0 1028.5 RS 0.0 1.2 13 SSW  Overcast
5th
-1.1 10.4 9.7 70 4.5 0.2 1016.4 F 1.5 3.6 29 SW  Rain pm
6th
2.4 7.2 7.1 64 0.8 0.3 1028.0 ST 0.0 1.8 12 SW  Cloudy
7th
5.5 8.8 8.7 80 5.5 0.0 1025.4 FS 0.0 1.2 11 SW  Cloudy
8th
3.9 11.3 11.2 73 6.6 0.8 1024.6 FS 0.0 2.2 14 SW  Sunny spells
9th
4.9 11.1 10.9 80 7.6 1.2 1028.5 FS 0.3 0.9 13 SW  Fog am
10th
-1.1 4.6 4.6 94 3.7 0.5 1031.1 ST 0.3 0.0 3 SE  Fog am
11th
-0.8 2.9 2.7 97 2.3 0.2 1028.7 F 0.3 0.1 5 SE  Fog
12th
-1.6 5.1 4.9 98 4.7 1.2 1024.1 FS 0.3 0.0 2 SE  Fog am
13th
2.2 10.4 10.3 83 7.5 0.0 1017.7 F 1.0 1.4 14 SE  Rain eve
14th
2.7 11.3 11.2 82 8.3 0.2 1023.1 F 2.3 3.7 21 SW  Rain night pm
15th
9.2 11.1 10.9 93 9.8 0.0 1019.6 F 7.6 5.2 22 SW  Rain pm
16th
10.4 12.2 11.9 90 10.4 0.0 1016.3 ST 7.1 4.8 25 SW  Rain
17th
4.4 7.3 6.1 92 4.9 0.1 1021.5 F 6.6 0.6 12 SE  Rain
18th
5.8 9.9 9.7 82 6.8 0.2 1007.8 FQ 10.7 4.2 31 SW  Rain
19th
4.7 8.4 8.3 65 2.1 1.3 1003.7 RS 5.6 2.2 17 SW  Rain eve.
20th
1.3 9.7 9.2 73 4.6 0.7 1022.2 RS 0.0 3.7 25 SW  Sunny spells
21st
9.2 11.7 10.2 92 9.0 0.0 1012.1 F 18.3 8.0 34 SW  Rain
22nd
7.6 9.9 9.6 71 4.6 1.0 1008.3 ST 4.8 4.8 29 SW  Showers am
23rd
5.4 11.1 10.6 90 9.0 0.0 992.7 FR 39.4 7.5 35 SW  Rain, gale
24th
8.1 11.1 9.6 73 5.0 0.2 980.4 RS 26.7 5.4 39 SW  Rain, gale am
25th
3.9 7.3 6.8 82 3.9 0.8 985.2 RS 4.3 1.6 20 SW  Rain showers
26th
1.5 6.8 6.8 85 4.4 1.2 997.6 RS 0.5 0.9 21 SW  Showers night am
27th
3.8 11.1 8.5 83 5.8 0.0 987.3 RS 11.4 7.1 33 SW  Rain
28th
5.3 8.9 8.9 63 2.2 0.7 997.7 RS 0.3 2.2 13 SW  Rain shower pm
29th
0.3 7.2 7.0 71 2.1 1.2 1017.5 RS 0.3 1.2 13 SW  Sunny
30th
4.4 9.7 9.7 87 7.6 0.2 1007.3 RS 10.4 5.3 35 SW  Rain
31st
6.8 9.9 7.6 89 5.9 0.0 1001.7 FS 6.6 3.2 24 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 limited this month to a part of the afternoon only. The sensor receives less than 25% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation, 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
HP 1036 hPa SW Ireland, LP 979 hPa Central Finland. Cloudy and rather dull morning, brightening in mid afternoon with brief sunshine.
24
Overcast and rather dull, some breaks in the cloudsheet briefly in the afternoon.
3rd
Overcast and dull all day.
4th
Overcast for most of the day, cloud clearing slowly in late afternoon.
5th
LP 974 hPa Shetland moving quickly east and deepening. Ground/air frost followed by a fairly swift rise in temperature and windspeed in midmorning, Mainly cloudy with a brighter spell in morning and afternoon. A spell of rain from a cold front around 16.00. Very stormy in the north of the UK.
6th
A mainly cloudy day but with some brighter and short sunny spells.
7th
A cloudy day with a few small breaks in the cloud but mainly rather dull.
8th
A bright day with some sunny spells in the morning and afternoon.
9th
Early mist and fog, most dense around 09.30 before clearing slowly to give some sunny spells between 11.00 and sunset. Precipitation from condensation.
10th
HP 1037 hPa Switzerland. Fog in the morning until 10.30, clearing to give some sunny spells but rather cloudy at times. Precipitation from condensation.
11th
Dense fog through the night and much of the day with visibility down to 100m at times, only clearing after 14.00 to give some hazy sunshine briefly. Precipitation from condensation.
12th
Dense fog through the night and most of the morning with visibility below 100m at times. Clearing after 11.00 to give some spells of hazy sunshine. Precipitation from condensation.
13th
The fog replaced by overcast and dull sky with spots of drizzle. A spell of rain in late afternoon.
14th
A bright morning with sunny periods, clouding over in the afternoon and becoming dull.
15th
Patchy cloud early, soon becoming overcast with rain in the afternoon and another spell in the evening/night.
16th
Spells of rain continue through the early hours, a very gloomy day with outbreaks of drizzle. Heavier rain in early evening as cold front passes.
17th
Light rain and drizzle overnight and into the morning. A very brief moment of brightness in late morning before cloud returns in the afternoon with more rain later.
18th
Light rain and drizzle just after midnight. A fair morning with some short sunny spells, cloudier in the afternoon and becoming overcast with rain later which is heavy for a time in late evening.
19th
A spell of heavy rain around 01.00 as cold front passes. A bright day with some long spells of sunshine in the morning and afternoon interrupted by some patches of high cloud. Clouding over from late afternoon followed by a band of rain, briefly heavy, in the evening.
20th
HP 1034 hPa E of Azores, LP 961 hPa Iceland. Ground frost first thing, bright and sunny morning with more patches of cloud spreadin in from early afternoon.
21st
HP 1037 hPa Spain, LP 954 hPa Iceland. A dull and overcast day with rain, heavy at times accompnaied by gusty winds. Further heavy rain in the evening.
22nd
LP 981 hPa S Norway. Two early morning showers, the second squally with heavy rain as a trough passes around 08.00. Some long sunny spells develop after 11.00.
23rd
LP 954 hPa W of Ireland. Dull with rain starting after 09.00 and lasting all day, becoming extremely windy from late morning.
24th
LP 931 hPa near Outer Hebrides. Continuing rain, sometimes heavy, with extremely strong wind gusts until 06.30. Some further outbreaks of rain until mid-morning. A little brightness in the afternoon followed by rain showers into the night.
25th
Rain showers in the night, sunny spells and light rain showers during the day.
26th
Rain showers in the night. Fog and mist clearing by 09.30 to leave the rest of the day sunny.
27th
LP 949 hPa N Scotland. Very windy night with rain until 07.00, light at first heavier later. A very blustery and heavy rain shower in early afternoon.
28th
Bright with some sunny spells before a couple of brief light rain showers arrive in mid-afternoon.
29th
Ground frost with precipitation from condensation. A clear and sunny day.
30th
Windy with light rain in the early hours becoming heavier in the middle of the day before clearing by 13.30 to give a little brightness.
31st
Rain throughout the day, lighter in the morning with heavier spells in the afternoon.