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FEBRUARY 2010 daily and monthly summary

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FEBRUARY 2010
March
1st - 7th
1st, LP 998 hPa Denmark, HP 1022 hPa W of Finisterre, passage of trough early am gave graupel (soft hail) shower with a light dusting, sunny periods later. 2nd, light rain pm. 3rd, LP cells mid-Atlantic and 991 hPa S Sweden, HP 1028 hPa N Africa, warm front gives mainly dull day with light rain am and brief drizzle pm. 4th, light rain early am, brighter pm. 5th, LP 977hPa WSW of Ireland, light rain from warm front followed by moderate rain from cold front early am, one rain shower early pm, first day to reach 10 °C since 10/12/2009. 6th, mainly cloudy. 7th, rather dull with some drizzle late pm.
8th - 15th
8th, dull with drizzle and sleet am and pm with snow grains and light snow evening. 9th, HP 1026 hPa Iceland ridging SSE, LP 1009 hPa North Sea, sunny spells, light sleet late night. 10th, sunny spells and light snow flurries (light snow covering around Sevenoaks). Night of 10th and daytime 11th, "snow train" along the Channel and Straits of Dover delivers heavy snow just 30 miles+ away to east/south Kent and East Sussex with up to 20cm in places but there is No snow cover here at all. 13th, light drizzle early night. 14th, LP 1005 hPa near SE Iceland, HP 1026 hPa W of Ireland at 20°W, some light sleet with snowflakes am. 15th, flurry of snow evening.
16th - 22nd
16th, LP NW Scotland moving SE, rain - mainly light but with heavier showers later from 05.30 intermittently to 16.00 from series of fronts. 17th, a sunny day. 18th, LP 987 hPa over central southern England, light rain from mid morning to mid afternoon with a heavier shower early evening. 21st, UK surrounded by LP systems, and LP 989 hPa over S England, rain am - more showery pm from fronts. 22nd, LP 977 hPa English Channel, light rain from early am through most of the day, drizzly later, from occluded front.
23rd - 28th
Continuing unsettled with LP systems crossing the south of the UK from the SW. 23rd, light rain early pm and night. 24th, LP 983 hPa English Channel, periods of rain from early morning to late evening with a drier and brighter spell middle of the day. 25th, a new LP 979 hPa W of Brittany pushes fronts across the SE, light rain from mid afternoon onwards becoming heavy early evening. 26th, light rain early am, brighter later and same again on 27th. 28th, LP 971 hPa tracking NE from Biscay to N France, prolonged light/moderate rain from early morning..
FEBRUARY 2009 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
6.0
  ºC ( -1.9C )*
 Daily Minimum
1.2
  ºC ( -1.2C )*
 Daily Mean
3.51
  ºC ( -1.2C )*
 EXTREMES
 High Maximum
10.7
  ºC ( 24th & 27th )
 Low Minimum
-3.6
  ºC ( 15th )
 Low Maximum
1.9
  ºC (   8th )
 High Minimum
5.9
  ºC ( 25th)
 
   
 Days with max => 10 °C
3
   ( -7 )*
 Days with max <0 °C (ice days)
0
   ( ±0 )*
 Days with air frost
11
   ( +3 )*
 
PRECIPITATION
 Monthly Total
83.0
  mm ( +162% )
 Days with measurable precip
20
  Days ( +6 )*
   ...of which, days with >= 1.0 mm
14
  Days ( +3 )*
   ...and days with snowfall observed
6
  Days  
 Days with Snow Cover
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
31.0
  mm/hr ( 21st )
 High Rain Total in 1 day
19.3
  mm ( 28th )
 High Rain Total in 1 hour
1.5
  mm ( 22nd, 05.31)
 EVAPO-TRANSPIRATION
 Total for month
17.2
  mm  
 High Total for 1 day
1.3
  mm ( 26th )
APPARENT TEMPERATURE
 Low Wind Chill
-6.1
  ºC ( 10th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-4.3
  ºC ( 11th )
 High Temp/Hum/Wind Index
10.5
  ºC ( 24th )
 High Temp/Hum/Sun/Wind Index
18.4
  ºC ( 27th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
8.0
  ºC ( 24th )
 Low Dewpoint
-7.3
  ºC ( 11th )
 Average Dewpoint at 14h
1.0
  ºC  
 Low Relative Humidity
47
  % ( 26th )
 Average RH at 14h
74
  %  
WIND SPEED & DIRECTION
 Monthly Average
2.0
  mph  
 Windiest day (Average)
4.4
  mph ( 10th )
 Highest Gust
25
  mph ( 26th)
 Dominant Direction
N
  ( 30% )
 
BAROMETER
 Monthly Mean
1001.7
  hPa  
 High Barometer
1022.9
  hPa (   7th )
 Low Barometer
975.7
  hPa ( 28th )
SUNSHINE
 Max Sensor Exposure to direct sun
4 - 7
  hours/day (9 - 10 possible)
 Calculated Monthly Sunshine Hours
36.8
  hours  
 Estimated Actual Hours (approx)
55.0
  hours  
 Sunniest Day Measured
6.7
  hours ( 17th )
 Days with no sunshine
9
  Days  
 
FOG
 Number of Days with Fog
1
  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 in Midwinter is very limited. The sensor receives only up to 45 to 75% 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 2010
 
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
 -1.1 4.3 4.0 56 -4.0 3.7 1013.5 RS 0.3 1.5 13 SSW  Sunny spells
2nd
 -0.8 8.1 7.4 82 4.6 0.2 1002.0 F 0.8 3.7 22 SW  Rain pm
3rd
 2.5 7.6 4.2 81 1.2 0.0 1008.8 ST 1.5 1.2 16 SW  Rain am
4th
 3.7 8.6 8.3 78 4.7 0.3 1004.6 F 4.1 1.6 11 SE  Rain am
5th
 5.8 10.2 9.6 81 6.5 2.3 1001.0 RS 4.3 1.5 16 SW  Rain am
6th
 2.5 7.9 7.2 87 5.2 1.0 1014.0 R 0.0 0.9 10 N  Cloudy
7th
 3.2 5.2 5.1 78 1.5 0.0 1020.6 F 1.8 1.0 12 N  Drizzle
8th
 1.4 1.9 1.4 89 -0.2 0.0 1008.3 F 1.3 2.3 18 N  Sleet
9th
 -0.3 4.6 4.3 65 -1.7 1.7 1009.3 ST 0.3 2.9 16 N  Sunny spells
10th
 0.9 2.7 1.9 54 -6.5 3.0 1015.0 RS 0.0 4.4 22 N  Sunny spells
11th
 -1.2 2.7 2.2 52 -6.7 2.5 1019.3 ST 0.0 3.7 21 N  Sunny spells
12th
 -0.8 4.2 3.8 66 -1.9 0.1 1021.2 ST 0.0 1.6 14 N  Cloudy
13th
 0.7 3.4 3.4 66 -2.4 1.0 1019.4 F 0.3 2.3 17 N  Drizzle night
14th
 -0.8 3.6 3.4 84 0.8 0.1 1013.8 FS 0.5 0.4 8 NNE  Sleet am
15th
 -3.6 3.6 3.4 60 -3.6 3.7 1003.7 F 0.0 0.4 12 SW  Sunny am
16th
 1.8 5.5 4.9 88 3.1 0.0 991.7 FS 5.8 3.1 18 SW  Rain
17th
 -0.9 9.3 9.1 49 -1.1 6.7 988.6 FS 0.0 0.3 8 SE  Sunny
18th
 -2.2 5.8 5.2 90 3.7 0.0 988.2 F 5.1 1.0 16 SW  Rain
19th
 1.3 5.6 5.4 60 -1.7 1.3 993.4 ST 0.0 1.7 16 SSW  Cloudy
20th
 -2.8 6.1 6.0 59 -1.4 4.8 996.2 FS 0.0 0.4 7 SSW  Sunny periods
21st
 -2.9 6.2 5.8 83 3.1 0.7 990.4 FS 3.6 1.6 18 SW  Rain
22nd
 3.3 4.3 3.9 92 2.8 0.0 980.0 RS 10.2 1.2 14 N  Rain
23rd
 2.0 3.9 3.1 84 0.7 0.0 991.3 ST 2.5 0.7 12 SW  Rain
24th
 3.0 10.7 9.7 88 7.8 1.2 989.9 FS 7.9 1.3 17 SW  Rain
25th
 5.9 9.0 8.9 82 6.0 0.0 987.5 F 11.4 2.7 21 SW  Rain
26th
 5.1 8.0 7.6 58 -0.1 1.2 990.8 R 0.5 4.9 25 SW  Rain am
27th
 5.2 10.7 10.7 72 5.8 1.3 992.0 F 1.5 2.6 17 SW  Rain am
28th
 3.9 5.1 4.3 87 2.3 0.0 990.0 RQ 19.3 3.0 24 N  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 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