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FEBRUARY 2009 daily and monthly summary

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FEBRUARY 2009
March 2009

1st - 8th
1st, HP 1038 hPa near Oslo, LP 980 hPa W of Portugal, moderate snow showers pm and evening giving patchy cover up to 4cm by the morning of the 2nd. LP 989 hPa pushing NNW with fronts from N France on the 2nd brings more persistent frontal snow, mostly moderate, from 9am onwards until evening. Total maximum snow cover approx 9cm. 3rd, LP 985 hPa southern Irish Sea with HP slipping away to Ukraine, sunny day with fairly rapid thawing except in deep shade. By the end of the 5th snow cover virtually nil. 6th, LP 980 hPa over Channel Islands, 988 hPa NE Scotland and 991 hPa over Denmark. Light rain becoming moderate early morning. Sleet with light snow late evening, not settling. 7th, light /moderate rain late evening.
9th - 14th
9th, (wettest February day in these site records) LP 976 hPa approaching through the English Channel. Light and moderate rain from 7am lasting all day becoming heavy and squally after 10pm, lighter rain finally stopped around 6am on the 10th. 11th, rain showers afternoon (light) and evening (moderate). 12th, warm front brings rain at first followed by snow (light dusting) then back to rain overnight into 13th.
15th - 20th
15th, HP 1032 hPa C France ridging E & W, LP 1008 hPa NE of Shetland with warm and cold fronts trailing over UK. Temperature reaches 10 °C for first time since December 23rd on the 16th. 17th, HP 1031 hPa S of Ireland and weak fronts in the North Sea. Some light drizzle on 18th and 19th as dull conditions prevail. 20th, HP 1034 hPa over S UK and Ireland, LPs W and SW of Iceland.


MONTHLY SUMMARY FEBRUARY 2009
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
7.4
 ºC ( -0.5C )*
 Daily Minimum
1.8
 ºC ( -0.7C )*
 Daily Mean
4.35
 ºC  
 EXTREMES
 High Maximum
14.5
 ºC ( 27th )
 Low Minimum
-6.6
 ºC (  3rd )
 Low Maximum
0.4
 ºC (  2nd )
 High Minimum
7.3
 ºC ( 23rd )
 
   
 Days with max => 10 °C
5
  ( -3 )*
 Days with max < 0 °C ("Ice Day")
0
   
 Days with Air Frost
11
  ( +3 )*
 
PRECIPITATION
 Monthly Total
58.0
 mm ( 117% )*
 Days with measurable precip
14
 Days ( ±0 )*
   ...of which, days with >= 1.0 mm
10
 Days ( -1 )*
   ...and days with snowfall observed
4
 Days  
 Days with Snow Cover
4
 Days  
 Days with Thunder
0
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
20.6
 mm/hr ( 9th )
 High Rain Total in 1 day
28.2
 mm ( 9th )
 High Rain Total in 1 hour
6.3
 mm ( 9th, 23h )
 EVAPO-TRANSPIRATION
 Total for month
18.0
 mm  
 High Total for 1 day
1.7
 mm ( 27th )
APPARENT TEMPERATURE
 Low Wind Chill
-7.1
 ºC (   3rd)
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-7.2
 ºC (   3rd )
 High Temp/Hum/Wind Index
13.7
 ºC ( 27th )
 High Temp/Hum/Sun/Wind Index
24.1
 ºC ( 27th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
7.8
 ºC ( 9th )
 Low Dewpoint
-8.1
 ºC ( 3rd )
 Average Dewpoint at 14h
1.9
 ºC  
 Low Relative Humidity
52
 % ( 8th )
 Average RH at 14h
71
 %  
WIND SPEED & DIRECTION
 Monthly Average
1.1
 mph  
 Windiest day (Average)
3.7
 mph ( 10th )
 Highest Gust
29
 mph ( 10th )
 Dominant Direction
N
 ( 21% )
 
BAROMETER
 Monthly Mean
1014.2
 hPa  
 High Barometer
1032.1
 hPa ( 21st  )
 Low Barometer
974.1
 hPa ( 10th )
SUNSHINE
 Max Actual Sensor Exposure to sun
4-7
 hours/day (10.5 possible)
 Calculated Monthly Sunshine Hours
44.1
 hours  
 Estimated Actual Hours (approx)
62.0
 hours  
 Sunniest Day Measured
6.7
 hours ( 27th )
 Days with no sunshine
8
 Days  
 
FOG
 Number of Days with Fog
2
 Days  
NEW RECORDS SET THIS MONTH
 
* deviation from average 1984 - 2008
‡ 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 40-60% 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 2009
 
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)
High Gust
(mph)
Dominant
(Compass)
 Precipitation
 type etc
                       
1st
-2.1 1.9 0.3 79 -2.9 0.9 1007.4 F 1.5 1.6 16 SE
 SHSN+
2nd
-2.8 0.4 0.3 88 -1.5 0.0 991.7 FQ 4.3 0.3 10 NE
 Snow
3rd
-6.6 3.8 3.8 71 -2.2 3.5 997.2 FS 0.0 0.4 14 SE
 Sunny
4th
-4.6 2.9 2.9 67 -2.6 1.8 993.1 F 0.0 0.2 10 SE
 Fair
5th
-0.2 6.6 6.6 92 5.4 0.2 986.7 ST 5.6 0.2 6 SE
 Rain, drizzle
6th
1.4 3.4 2.4 92 1.2 0.0 987.7 RS 3.3 1.2 12 N
 Rain, RASN, SN-
7th
-1.2 3.0 2.7 73 -1.6 1.5 994.9 RS 0.0 1.6 12 N
 Fair
8th
-0.7 6.4 6.2 54 -2.4 4.0 1002.4 FS 3.0 0.9 12 SW
 Fine
9th
1.3 9.1 4.2 91 2.8 0.0 994.2 FQ 28.2 1.7 24 SW
 Rain
10th
1.3 5.3 4.4 73 -0.0 0.7 1004.8 RQ 3.3 3.7 29 N
 Rain am
11th
-1.6 7.1 6.9 66 1.0 3.0 1015.9 FS 1.5 1.1 12 SSW
 Rain showers
12th
-1.4 5.3 4.9 60 -2.2 3.3 1024.7 FS 1.8 1.1 12 N
 RASN evening
13th
0.3 5.7 5.3 68 -0.2 2.7 1022.1 RS 3.6 1.9 17 N
 Rain am
14th
-1.2 5.8 4.4 59 -2.9 2.2 1028.7 ST 0.0 0.2 7 N
 Fine
15th
-0.6 8.3 8.1 71 3.1 0.1 1025.8 F 0.0 1.2 12 SW
 Cloudy
16th
4.2 10.9 10.7 68 5.1 4.0 1024.1 FS 0.0 1.2 11 SW
 Fine
17th
5.6 10.6 10.4 76 6.4 0.8 1024.2 ST 0.0 1.7 14 N
 Cloudy
18th
5.1 7.7 7.7 77 3.9 0.0 1025.5 F 0.3 0.5 12 SE
 Overcast
19th
4.7 9.6 9.4 70 4.2 0.7 1026.6 ST 0.5 0.4 6 SW
 Fog am, drizzle
20th
4.8 9.2 9.2 68 3.6 1.3 1031.1 FS 0.0 0.2 6 SW
 Fine
21st
5.0 12.2 11.8 60 4.3 4.7 1030.4 FS 0.0 0.9 11 SW
 
22nd
6.3 10.1 9.8 59 2.1 0.0 1025.5 FS 0.0 1.9 17 N
 
23rd
7.3 9.8 9.4 77 5.6 0.0 1022.7 FS 0.0 0.8 10 N
 
24th
7.0 9.4 9.0 88 7.1 0.0 1026.8 FS 0.8 0.2 6 SE
 
25th
5.4 9.1 9.0 71 4.0 0.0 1027.1 FS 0.3 1.5 13 SSW
 
26th
5.9 9.9 9.4 61 2.3 1.7 1022.4 FS 0.0 2.0 12 SW
 
27th
5.7 14.5 14.2 59 6.3 6.7 1018.4 FS 0.0 1.6 11 SSW
 
28th
2.4 9.1 9.0 63 2.3 0.3 1013.0 F 0.0 0.3 6 SSW
 
                         
‡ 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 approx 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
Precipation/Weather notes: SHSN = snow showers, RASN = rain and snow or sleet; + = heavy; - = light