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JANUARY 2013 daily and monthly summary

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JANUARY 2013
February 2013

January 2013 monthyl summary stats to 16th
‡ 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 JANUARY 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
4.2 9.2 7.3 68 1.8 1.3 1008.1 R 0.8 1.7 12 SSW  Sunny
2nd
3.4 10.3 7.6 83 4.9 0.1 1023.3 ST 2.5 1.8 13 SSW  Rain
3rd
9.1 11.6 11.3 88 9.4 0.7 1032.0 RS 0.0 1.7 12 SSW  Cloudy
4th
8.9 9.8 9.8 77 5.9 0.7 1035.5 FS 0.0 1.6 12 W  Cloudy
5th
7.3 10.2 10.1 87 8.0 0.0 1033.0 FS 0.3 1.2 13 SSW  Drizzle am
6th
5.9 8.1 6.8 94 5.9 0.0 1030.5 F 0.0 0.7 10 SSW  Mist
7th
6.8 7.9 7.5 91 6.1 0.0 1024.9 FS 0.5 1.6 11 SSW  Drizzle
8th
7.1 10.8 10.6 79 7.1 0.7 1022.9 FS 0.3 2.6 16 SSW  Drizzle night pm
9th
8.8 9.2 8.3 92 7.1 0.0 1018.7 FS 2.8 0.5 10 N  Rain am
10th
0.0 4.6 4.6 86 2.4 0.0 1012.5 F 0.0 0.4 7 N  Cloudy
11th
1.4 4.1 4.0 87 2.0 0.2 1016.6 FS 0.0 0.3 7 SSW  Cloudy
12th
-0.7 4.3 3.3 80 0.2 0.0 1009.9 FS 3.3 0.6 15 SE  Rain
13th
2.2 3.3 2.6 73 -1.8 0.5 1017.2 ST 0.3 1.2 12 N  Drizzle night am
14th
-0.5 3.7 3.1 88 1.3 0.0 1006.6 F 2.5 1.1 13 SW  Snow am, Rain pm
15th
0.7 3.0 2.8 74 -1.3 1.8 1008.5 ST 0.5 2.6 18 N  Rain/sleet am
16th
-3.3 -0.3 -0.6 91 -1.8 0.0 1011.4 RS 0.3 0.0 3 SE  Fog
17th
-5.1 2.6 2.6 84 0.2 1.8 1016.2 FS 0.0 0.0 3 ESE  Sunny
18th
-1.9 -0.2 -1.1 86 -3.1 0.0 999.3 F 1.0 1.1 16 SE  Snow
19th
-0.9 0.6 0.4 82 -2.3 0.0 994.4 RS 0.0 0.8 8 NE  Overcast
20th
-1.0 -0.1 -0.2 89 -1.8 0.0 991.1 F 3.6 1.0 12 N  Snow
21st
-1.1 0.3 0.3 86 -1.7 0.0 993.2 RS 0.0 0.1 5 SE  Overcast
22nd
-3.4 2.0 1.8 92 0.7 0.7 999.3 FS 0.3 0.5 13 SE  Light snow eve.
23rd
0.7 2.2 2.2 81 -0.8 0.0 1006.0 ST 0.0 0.5 10 NE  Overcast
24th
0.2 1.6 1.6 77 -2.0 0.0 1016.1 RS 0.3 0.1 6 N  Snow night am
25th
0.2 2.3 1.2 74 -2.9 0.2 1013.5 F 0.0 1.2 25 SE  Overcast
26th
0.2 7.5 7.3 72 2.6 3.0 1009.1 RS 3.8 2.6 18 SW  Rain am & night
27th
5.9 9.8 9.6 56 1.3 2.0 997.1 R 9.7 5.8 26 SW  Rain am
28th
2.9 10.0 8.3 78 4.7 0.3 1007.1 F 3.0 5.4 30 SW  Rain pm, eve
29th
8.6 12.4 12.3 90 10.7 0.0 1003.0 FS 2.0 7.3 27 SW  Drizzle
30th
8.7 11.3 10.8 58 2.9 2.2 1007.5 R 4.3 6.1 29 SW  Rain night am
31st
7.2 10.9 10.1 63 3.4 2.0 1010.8 RS 1.5 5.7 27 SW  Rain 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. 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
Overnight showers, briefly heavy. A sunny day, mainly clear with some scattered cloud in late afternoon.
2nd
Bright at sunrise, soon clouding over. Becoming overcast and dull with rain from around 14.00 to 16.00 from warm front.
3rd
HP 1037 hPa over Biscay. A cloudy day but with some brightness and a little sunshine in the afternoon.
4th
Rather murky in the morning, brightening to give a sunny spell in the middle of the day then clouding over in mid-afternoon.
5th
Another murky morning with some light drizzle early. Staying cloudy and dull all day.
6th
Fog early on, mist and murk never really clears until near sunset to reveal a cloudy sky.
7th
Dismal overcast again with light drizzle on and off all day.
8th
A surprisingly fine morning with some hazy sunshine, clouding over in the afternoon. Some drizzle just before midnight.
9th
Rain and drizzle continues overnight. Back to gloomy overcast with slow cleareance of cold front. Some breaks in the cloud near sunset.
10th
A cloudy day although not so dull but the only breaks in the cloud appear near sunset.
11th
Cloudy but sometimes bright with some brief hazy or weak sunshine morning and late afternoon.
12th
LP 1000 hPa Cornwall. Short spell of rain early am followed by cloudy but dry morning. A longer spell of rain afternoon and evening.
13th
Drizzle continues from previous night. Cloud clearing early to give a bright morning with one brief sunny interval. Increasing cloud from the NE through middle of the day with a very brief and gentle flurry of snowflakes. Clearing again after 14.15 to give more sunny intervals.
14th
Some light snowfall just before dawn giving a dusting on some surfaces. Staying overcast with drizzle and rain in the afternoon.
15th
Precipitation, probably sleet, in the early hours. A bright day with some sunny spells, cloudier in late afternoon.
16th
A foggy day with fog and mist not clearing until late afternoon.
17th
A hard ground frost, mainly clear skies giving uninterrupted sunshine until around 15.00 when cloud slowly creeps across.
18th
LP 988 hPa Ireland. Light snow starts around 09.30 and persists through the day with one or two more moderate spells and into the night. Covering of about 3cm at the end of the day.
19th
An overcast and gloomy day with a couple of very light snow flurries.
20th
LP 990 hPa NE France moving N. Snow starts just after 08.00 with spells of moderate snowfall. Continuing into late evening but becoming lighter before stopping around 22.00. Accumulation for the day around 8cm, on top of some existing snow cover.
21st
A cloudy/overcast day with a couple of very light snow/snowgrain flurries. A slight thaw with road surfaces becoming clear by the end of the day.
22nd
A cloudy day but with some bright intervals. A band of snow arrives late afternoon, four hours of light snow which doesn't settle afresh.
23rd
A cloudy and rather dull day. Some very light flurries of snow and sleet, mainly in the morning.
24th
A light dusting of new snow in the early hours of the morning. A cloudy and rather dull day, just a little bright spell in late afternoon.
25th
A cloudy and mainly dull day with some brightness in the middle of the day.
26th
Snow/sleet followed by rain in the early hours. A day of sunny periods with cloud increasing in the afternoon. Rain from early night.
27th
LP 938 hPa S of iceland. Rain overnight, sometimes heavy, from a series of fronts. Clearing around 09.00 to give a day of sunny spells.
28th
A bright morning with some sunshine, cloud increases through the day and rain arrives by 17.30, also becoming very windy.
29th
An overcast and dull day with intermittent light drizzle. More prolonged drizzle / light rain just before midnight.
30th
Two spells of rain, the second heavier and showery in the night. Cloudy but bright morning with some long sunny spells developing later.
31st
A spell of moderate squally rain from an occluded front between 06.30 and 07.30. Cloud clears to give some short sunny spells.