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FEBRUARY 2011 daily and monthly summary

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FEBRUARY 2011
March

1st
LP 965 hPa NE of Iceland, HP 1034 hPa Azores. HP 1031 hPa Balkans. Bright am with sunny intervals, cloudy pm with drizzle.
2nd
HP to south, from 1038 hPa mid Atlantic to 1030 hPa E Europe, LPs to 958 hPa NW and 994 hPa NE. Bright am, cloudy and dull pm, some light drizzle eve.
3rd
LP 970 hPa NNW of Ireland. Sunny periods, hazy due to high cloud, cloudy and increasingly windy late evening and night.
4th & 5th
Overcast and windy days with just occasional spots of light drizzle.
6th
LPs to W, NW, N & NE, HP 1030 hPa Spain & 1031 hPa Switzerland. Continued overcast with intermittent light drizzle, rain recorded around 01.00.
7th
LP 992 hPa deepening crossing N England / S Scotland eastwards. Almost a repeat of the 4th - 6th but cloud broke up a little late pm.
8th
HP ridge from south, early fog and mist clearing mid-morning to give a sunny day with little cloud.
9th
Overcast am, brighter pm with a couple of sunny intervals.
10th
HP from Spain to E Europe, LP 1009 hPa SW of Cornwall, warm front crosses southern UK. Rain from early morning, heavier pm, stopping 17.00h.
11th
Mainly overcast and dull, rain shower around sunrise, further light rain more persistent pm and evening.
12th
Light rain/drizzle early am, overcast breaking up after midday with sunny spells later.
13th
Drizzle mid-morning, some sunny intervals middle of the day but rain returns from mid afternoon lasting for rest of the day.
14th
Light rain/drizzle continuing overnight. Sunny spells through the day.
15th
LP 977 hPa SE Ireland, mainly overcast with a brief bright interval, spells of rain pm and evening.
16th
LP 972 hPa W of Biscay. Some light rain just after midnight, bright day with sunny spells.
17th
Cloudy with some spells of weak sunshine.
18th
Col, LPs to NW and SE, HP to NE and SSW. Fog am visibility <100m at times. Hazy sunshine pm.
19th
LP 1009 hPa moves along the Channel. Rain from occlusion from early morning to early afternoon, remaining overcast all day.
20th - 22nd
20th dry but remaining overcast and very dull all day, same on the 21st and 22nd but less dull.
23rd
LP 956 hPa SE of Iceland, HP to SW and SE. Intermittent rain and drizzle through the day as fronts cross the UK.
24th
Cloudy with weak sunshine am, sunny spells pm.
25th
Cloudy with sunny intervals am, becoming overcast pm.
26th
Intermittent rain am, some brightness with a heavy rain shower pm.
27th
Sunny start, clouding over after midday with a rain shower pm.
28th
HP 1035 hPa from far to SW of UK through Scotland to Norway, LP 1011 hPa Corsica. Overcast and dull with intermittent drizzle.

FEBRUARY 2011 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum 9.2  ºC ( +1.4C )*
 Daily Minimum 4.8  ºC ( +2.4C )*
 Daily Mean
6.95
 ºC ( c. +1.8C )
 EXTREMES
 High Maximum 15.2  ºC ( 24th )
 Low Minimum -2.2  ºC (   1st )
 Low Maximum 3.7  ºC ( 28th  )
 High Minimum 9.9  ºC (   5th  )
 
   
 Days with max => 10 °C 12   ( +3 )*
 Days with max <0 °C (ice days) 0   ( ± 0 )*
 Days with air frost 2   ( -6 )*
 
PRECIPITATION
 Monthly Total 42.3  mm ( 82% )
 Days with measurable precip 15  Days ( +1 )*
   ...of which, days with >= 1.0 mm 7  Days ( -3 )*
   ...and days with snowfall observed 0  Days  
 Days with Snow Cover 0  Days  
 Days with Thunder 0  Days  
 RAIN RATE & EXTREMES
 High Rain Rate 27.7  mm/hr ( 26th )
 High Rain Total in 1 day 9.7  mm ( 10th )
 High Rain Total in 1 hour 3.0  mm ( 26th, 16h30 )
 EVAPO-TRANSPIRATION
 Total for month 16.6  mm  
 High Total for 1 day 1.1  mm ( 4th )
APPARENT TEMPERATURE
 Low Wind Chill -3.9  ºC (   1st )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index -4.0  ºC (   1st )
 High Temp/Hum/Wind Index 14.5  ºC ( 24th )
 High Temp/Hum/Sun/Wind Index 22.1  ºC ( 24th )
 
DEWPOINT & HUMIDITY
 High Dewpoint 10.4  ºC ( 10th )
 Low Dewpoint -4.6  ºC (   1st )
 Average Dewpoint at 14h 5.4  ºC  
 Low Relative Humidity 53  % (   8th )
 Average RH at 14h 81  %  
WIND SPEED & DIRECTION
 Monthly Average 2.5  mph  
 Windiest day (Average) 8.9  mph ( 4th )
 Highest Gust 29  mph ( 3rd & 4th )
 Dominant Direction SW  ( 41% )
 
BAROMETER
 Monthly Mean 1013.5  hPa  
 High Barometer 1032.5  hPa ( 28th )
 Low Barometer 987.7  hPa ( 15th )
SUNSHINE
 Max Sensor Exposure to direct sun
6.0
 hours/day (9-10 possible)
 Calculated Monthly Sunshine Hours
32.0
 hours  
 Estimated Actual Hours (approx)
42.0
 hours  
 Sunniest Day Measured
5.7
 hours ( 8th )
 Days with no sunshine
12
 Days  
 
FOG
 Number of Days with Fog 2  Days  
NEW RECORDS SET THIS MONTH
 
‡ 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 60% 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 FEBRUARY 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
-2.2 6.7 6.1 89 4.4 0.8 1023.4 FS 0.3 1.0 11 SW  Drizzle pm
2nd
0.6 9.4 8.1 85 5.7 0.3 1022.2 F 0.3 3.4 19 SW  Drizzle eve.
3rd
3.6 9.9 9.8 66 3.8 3.7 1023.4 F 0.0 4.0 29 SW  Sunny periods
4th
7.5 11.5 11.3 76 7.2 0.0 1016.1 ST 0.0 8.9 29 SW  Overcast
5th
9.9 11.0 10.8 85 8.4 0.0 1017.8 FS 0.0 7.5 28 SW  Overcast
6th
9.3 10.3 9.8 81 6.7 0.0 1019.9 FS 0.3 6.9 26 SW  Drizzle
7th
7.7 10.1 9.9 85 7.5 0.0 1010.6 FS 0.0 5.3 28 SW  Overcast
8th
-0.6 10.7 10.5 66 4.4 5.7 1021.5 FS 0.0 0.2 7 SW  Fog am, sunny
9th
2.1 8.4 8.4 82 5.5 0.2 1016.2 FS 0.0 1.3 14 SE  Cloudy
10th
7.7 11.2 9.8 92 8.5 0.0 1010.3 F 9.7 3.4 16 SW  Rain
11th
8.1 11.4 11.3 89 9.6 0.0 1010.4 ST 2.0 2.4 14 SW  Rain pm
12th
8.3 10.2 9.7 75 5.5 0.8 1010.4 ST 0.8 2.0 11 SW  Rain am
13th
4.9 8.1 7.7 85 5.3 1.0 999.8 F 8.9 2.7 24 SW  Rain
14th
4.6 9.1 8.6 68 3.0 2.8 1001.3 FS 0.5 1.9 16 SW  Rain night am
15th
3.8 7.0 5.7 87 3.7 0.2 988.4 FS 3.6 2.1 22 SE  Rain pm
16th
4.3 10.4 10.3 68 4.6 3.7 993.9 RS 0.3 1.2 14 SE  Sunny spells
17th
3.1 8.8 8.7 79 5.3 1.2 1004.0 RS 0.0 0.7 7 N  Cloudy
18th
0.9 6.2 5.9 85 3.6 3.0 1012.4 ST 0.0 0.9 11 SE  Fog am
19th
2.6 6.5 6.3 92 5.1 0.0 1006.6 FS 5.6 1.0 12 SE  Rain
20th
4.4 5.2 5.1 90 3.6 0.0 1013.7 ST 0.0 0.9 7 N  Overcast
21st
4.1 6.9 6.3 81 3.3 0.0 1010.5 FS 0.0 0.5 11 SE  Overcast
22nd
4.1 6.7 6.1 84 3.6 0.0 1015.4 RS 0.0 0.4 8 SSE  Overcast
23rd
5.6 10.2 8.4 91 7.0 0.0 1014.4 FS 2.8 1.2 12 SW  Rain
24th
8.8 15.2 14.6 70 9.1 4.5 1021.4 ST 0.0 0.9 11 SSW  Sunny spells
25th
5.7 13.6 12.9 76 8.8 1.3 1023.2 FS 0.0 2.0 18 SW  Sunny intervals am
26th
9.1 9.6 8.4 83 5.7 0.3 1011.2 ST 5.6 3.4 18 SW  Rain
27th
3.8 8.7 8.7 61 1.6 2.5 1017.3 FS 0.5 1.8 16 N  Rain shower pm
28th
3.0 3.7 3.5 86 1.4 0.0 1028.0 RS 0.8 2.4 17 N  Drizzle
                         
‡ 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