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JANUARY 2012 daily and monthly summary

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JANUARY 2012
February

January 2012 monthly 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 JANUARY 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
11.4 12.4 11.6 90 10.0 0.0 1001.6 F 8.4 4.1 21 SW  Rain pm
2nd
4.8 7.4 7.4 64 1.0 1.7 1009.0 RS 0.0 3.9 18 SW  Sunny
3rd
5.6 11.9 8.1 86 5.9 0.7 998.2 R 15.0 7.9 34 SW  Rain am
4th
4.7 8.8 8.2 70 3.0 0.1 1016.2 F 1.5 5.3 27 SW  Rain eve.
5th
7.8 11.9 9.3 61 2.2 0.5 1002.1 RQ 0.0 7.1 35 N  Cloudy
6th
3.6 8.1 7.7 67 2.0 2.0 1024.5 FS 0.0 1.9 14 SSW  Sunny
7th
8.0 10.2 9.9 58 2.0 1.0 1021.2 ST 0.0 2.4 17 SSW  Fair
8th
6.9 8.9 8.9 66 2.9 0.0 1025.6 ST 0.0 1.2 12 SSW  Cloudy
9th
7.6 11.8 11.7 73 7.0 0.0 1027.7 ST 0.0 1.6 14 SSW  Cloudy
10th
8.3 11.2 11.1 79 7.6 0.5 1031.4 FS 0.0 1.3 14 SSW  Cloudy
11th
6.4 11.2 11.2 74 6.8 1.8 1031.2 FS 0.0 1.9 14 SSW  Sunny
12th
6.7 12.2 11.9 77 8.0 0.2 1023.8 FS 0.0 2.9 19 SW  Cloudy
13th
2.3 6.6 6.4 72 1.7 1.7 1031.2 ST 0.0 0.3 7 N  Sunny periods
14th
-3.8 5.6 5.6 82 2.7 2.0 1027.1 F 0.0 0.0 5 ESE  Sunny
15th
-2.7 6.4 6.2 66 0.3 1.7 1022.2 FS 0.3 0.2 13 SE  Sunny periods
16th
-3.0 6.2 6.2 59 -1.3 2.0 1023.7 FS 0.0 0.0 6 SE  Sunny
17th
-4.1 4.2 3.2 83 0.6 2.0 1026.4 FS 0.0 0.1 6 SSW  Sunny periods
18th
1.9 11.1 9.9 93 8.8 0.0 1021.9 FS 0.3 3.1 17 SW  Drizzle
19th
10.9 11.8 10.2 79 6.7 1.2 1017.0 ST 1.8 4.2 22 SW  Rain am
20th
4.8 9.7 9.7 76 5.6 0.0 1016.6 FS 0.0 3.0 24 SW  Overcast
21st
8.3 12.6 12.4 67 6.4 0.3 1008.3 FS 0.0 4.3 22 SW  Cloudy
22nd
5.4 11.8 11.6 56 3.1 1.5 1010.7 RS 0.0 2.9 19 SW  Sunny spells
23rd
4.7 8.3 8.1 70 3.0 0.0 1016.8 FS 0.0 1.2 10 SSW  Cloudy
24th
2.2 7.3 6.5 89 4.8 0.0 1015.4 F 5.1 0.3 7 SSW  Rain
25th
7.3 9.5 9.5 81 6.4 0.2 1013.7 F 0.3 1.6 19 SSW  Cloudy
26th
6.0 9.4 7.9 68 2.4 1.5 1007.5 RS 4.6 3.4 18 SW  Rain am
27th
0.4 8.7 8.1 63 1.5 3.0 1018.9 ST 0.0 1.0 10 SSW  Sunny
28th
0.9 5.8 5.6 77 1.8 0.5 1027.4 RS 0.8 1.0 12 N  Rain showers eve.
29th
1.6 3.9 3.6 88 1.8 0.3 1028.5 FS 0.0 0.1 6 N  Cloudy
30th
0.3 3.4 3.4 72 -1.2 0.0 1023.2 F 0.3 0.2 10 N  Sleet/Snow am
31st
0.0 1.4 1.2 86 -0.9 0.0 1024.7 ST 0.3 0.5 12 N  Snow grains am
                         
‡ 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 this month due to building obstruction. The sensor receives less than 25-30% 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

1st
LPs 953 and 956 hPa near Iceland, HP 1023 hPa S France. Fronts over S England.
Dull and overcast with rain starting shortly after midday and lasting into the evening.
2nd
A sunny day with just a few small wispy clouds now and again.
3rd
LP 952 hPa Outer Hebrides. Warm then cold fronts crossing the UK.
Rain and strong gusty winds from early morning. Heavy rain burst from squall line at 12.30, spell of sunshine early pm after clearance.
4th
Cloudy but fine start with some short-lived brightness. Increasingly dull into the afternoon with some drizzle and rain in the evening.
5th
Very windy night and day. Mainly cloudy but with some sunny intervals and a couple of brief light rain showers.
6th
A fine day with sunshine, sometimes hazy due to thin high cloud.
7th
Mainly cloudy but bright with some sunny intervals.
8th
Overcast / cloudy and mostly rather dull.
9th

HP 1034 hPa Biscay.LP 972 hPa N of Iceland.
Overcast / cloudy but with some brief breaks in the cloudsheet.

10th
Mainly cloudy but bright with some sunny intervals.
11th
A sunny day but a cloudsheet moves across during late afternoon.
12th
Variable amounts of cloud during the day, sometimes broken with sunny intervals but mainly cloudy until near sunset.
13th
Periods of sunshine interrupted by some thin high cloud in the late morning.
14th
Hard ground frost, a sunny day from start to end with hardly any cloud.
15th
HP 1029 hPa North Sea, LPs to west, south and south-east.
Hard ground frost again, sunny morning, patches of cloud in the afternoon interrupt the sunshine from time to time. Precipitation from frost melt.
16th
Hard ground frost once more, a sunny day with just some patchy high cloud.
17th
Lighter ground frost with drier air, sunny morning increasing cloud from midday and into the afternoon.
18th
Overcast and rather gloomy with outbreaks of light drizzle.
19th
Overcast and gloomy morning with outbreaks of rain with passage of cold front. Sunny intervals in the afternoon.
20th
Overcast and gloomy with some spots of light drizzle.
21th
Mainly cloudy and sometimes dull but also a few breaks giving some brief sunny intervals.
22nd
LP 994 hPa NE Scotland. Azores HP 1032 hPa.
Spells of cloud mixed with short spells of sunshine through the day.
23rd
A persistent medium height cloud sheet from early morning with some small breaks of blue sky but no sunshine.
24th
Dull and overcast with rain in the morning, turning to drizzle in the afternoon.
25th
Dull and overcast with drizzle early morning, a couple of brief brighter spells during the day.
26th
Heavy burst of rain before dawn, then becoming drizzly. Cloudy but fair later with a short heavy shower around 13.00 then clearing to give sunny periods.
27th
Slight ground frost, a sunny day with just a few patches of cloud to interrupt the sunshine now and then.
28th
Sunny start becoming cloudy with brief brighter intervals. Rain showers after 17.00h.
29th
A rather cloudy day with a bright interval in the middle of the day.
30th
Dull morning with short outbreaks of snow grains and sleet. Cloudy but brighter afternoon.
31st
Dull morning with outbreaks of snow grains, not settling. Cloudy but dry afternoon.