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JANUARY 2008 daily and monthly summary

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JANUARY 2008
February 2008

1st - 7th
Fog during morning of 1st, light rain late afternoon. HP of 1061hPa around St Petersburg and LP 961hPa to W gives chilly SE winds with light wintry showers around midday 3rd. Very gloomy on the 4th with rain from 7pm to 11pm, brighter on the 5th with an afternoon shower. :ight rain overnight 6th/7th and showers mid afternoon 7th.
8th - 14th
Mostly very unsettled with strong winds and rain, although the 9th was bright after clearance of a cold front overnight. The 10th gloomy with rain late afternoon and evening. Secondary LP in the English Channel moving NE on the 11th brings moderate rain through the morning. The 12th is a bright and sunny day with light rain just before midnight and early morning 13th.
15th - 21st
Continuing very unsettled. Deep lows over UK on 15th, an atrocious day with widespread stormy winds and heavy rain. 16th was brighter with some sunshine, 17th was drizzly am with heavy shower pm. Another wet morning 18th brings very mild Tropical Maritime air, the night of 18th/19th was the mildest January night recorded here since data collection started in 1984.
22nd - 31st
HP starts to establish over Spain and France with LPs to the north, becoming much brighter and more settled. Long sunny periods 26th and 27th. Fog morning of 28th and mist 29th am. On the 31st a vigorous LP at 956 hPa and deepening passes the North of Scotland bringing Arctic Maritime air with snow to northern Britain.

JANUARY 2008 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
9.2
 ºC ( +2.0C )*
 Daily Minimum
5.1
 ºC ( +2.4C )*
 Daily Mean
7.2
 ºC ( +2.3C )*
 EXTREMES
 High Maximum
13.1
 ºC ( 19th )
 Low Minimum
-0.1
 ºC ( 17th )
 Low Maximum
2.4
 ºC (   3rd )
 High Minimum
11.8
 ºC ( 19th )
 
   
 Days with Air Frost
3
  ( -3 )*
 Days with max > 10º
14
  ( +6 )*
 Days with max < 5º
1
  ( -5 )*
 
PRECIPITATION
 Monthly Total
74.9
 mm ( 97% )
 Days with measurable precip
21
 Days ( +3 )
   ...of which, days with >= 1.0 mm
11
 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
17.0
 mm/hr ( 31st )
 High Rain Total in 1 day
27.9
 mm ( 15th )
 High Rain Total in 1 hour
4.8
 mm ( 11th, 08h)
 EVAPO-TRANSPIRATION
 Total for month
18.8
 mm  
 High Total for 1 day
1.1
 mm (  7th )
APPARENT TEMPERATURE
 Low Wind Chill
-1.6
 ºC (   3rd )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-1.8
 ºC (   3rd )
 High Temp/Hum/Wind Index
12.6
 ºC ( 19th )
 High Temp/Hum/Sun/Wind Index
14.2
 ºC ( 27th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
10.4
 ºC ( 18th )
 Low Dewpoint
-4.5
 ºC (   3rd )
 Average Dewpoint at 14h
5.0
 ºC  
 Low Relative Humidity
46
 % ( 24th )
 Average RH at 14h
77
 %  
WIND SPEED & DIRECTION
 Monthly Average
3.9
 mph  
 Windiest day (Average)
7.4
 mph ( 15th )
 Highest Gust
34
 mph ( 15th & 31st )
 Dominant Direction
SSW
 ( 42% )
 
BAROMETER
 Monthly Mean
1012.2
 hPa  
 High Barometer
1037.0
 hPa ( 25th )
 Low Barometer
975.5
 hPa ( 15th )
SUNSHINE
 Max Sensor Exposure to direct sun
2-4
 hours/day (8-9 possible)
 Calculated Monthly Sunshine Hours
28.2
 hours  
 Estimated Actual Hours (approx)
45.0
 hours  
 Sunniest Day Measured
3.5
 hours ( 27th )
 Days with no sunshine
12
 Days  
 
FOG
 Number of Days with Fog
2
 Days  
NEW SITE RECORDS SET THIS MONTH
  • Wettest January day
  • Highest monthly minimum absolute temperature for January
‡ 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 30% 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 2008
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(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)
                     
1st
5.3 8.6 8.5 90 7.0 0.0 1020.6 f 0.8 0.1 3 SW
2nd
2.9 3.9 3.7 71 -1.1 1.5 1012.8 f 0.3 1.5 19 SE
3rd
-0.1 2.4 1.1 87 -0.8 0.0 998.9 fs 0.3 1.1 17 SE
4th
2.3 8.6 7.7 88 5.9 0.0 1000.1 fs 5.8 2.2 20 SW
5th
6.8 8.4 8.1 66 2.1 0.4 999.3 rs 0.3 4.3 24 SSW
6th
2.0 7.7 7.4 69 2.1 0.8 1010.8 fs 0.5 1.9 22 SSW
7th
6.7 9.6 8.1 80 4.8 0.9 1009.9 st 0.8 5.7 26 SSW
8th
5.4 9.8 9.7 80 6.4 0.0 1010.9 f 2.0 5.2 25 SSW
9th
5.7 7.9 7.8 65 1.6 1.5 1010.2 st 0.5 4.9 24 SSW
10th
6.6 10.9 10.4 81 7.3 0.0 999.7 f 2.0 7.0 30 SW
11th
6.9 9.7 9.6 83 6.9 0.1 987.5 f 14.3 2.3 25 SW
12th
2.4 7.7 7.6 71 2.7 2.0 1008.3 rs 0.3 2.8 19 SSW
13th
7.7 10.6 10.2 76 6.2 0.3 1003.4 f 1.5 5.3 32 SW
14th
6.8 9.3 9.2 78 5.5 0.8 996.0 fs 3.0 5.9 25 SW
15th
7.4 10.9 10.9 88 9.0 0.0 980.2 f 27.9 7.4 34 SW
16th
4.7 7.9 7.7 77 3.9 0.6 993.7 r 0.0 1.8 17 SSW
17th
-0.1 10.7 9.9 89 8.2 0.0 996.8 f 1.3 3.9 21 SSW
18th
7.4 12.5 11.9 90 10.4 0.0 1009.2 st 3.3 6.2 26 SSW
19th
12.2 13.1 12.9 83 10.1 0.0 1019.5 rs 0.0 6.9 25 SSW
20th
11.8 12.8 12.5 81 9.3 0.0 1020.0 fs 0.0 6.1 21 SSW
21st
10.3 10.7 10.4 84 7.8 0.0 1007.9 fq 0.8 6.6 26 SSW
22nd
3.4 7.3 7.3 63 0.7 2.2 1027.0 rs 0.0 2.1 21 SSW
23rd
4.9 11.9 11.3 84 8.7 0.0 1023.8 fs 0.3 5.4 25 SSW
24th
10.2 10.9 9.9 54 1.1 1.5 1027.5 r 0.0 3.6 18 SSW
25th
1.4 10.1 9.9 63 3.2 1.8 1035.3 fs 0.0 3.9 20 SSW
26th
5.7 10.3 9.9 67 4.1 3.2 1033.1 f 0.0 3.9 19 SSW
27th
4.3 10.4 10.2 71 5.2 3.5 1032.3 fs 0.0 2.0 14 SSW
28th
-0.1 6.1 5.3 92 4.1 1.5 1032.1 f 0.0 0.6 7 SSW
29th
1.9 10.1 9.6 73 5.0 2.0 1024.9 f 0.0 1.7 12 SSW
30th
4.1 7.1 6.9 60 -0.3 3.2 1027.2 st 2.8 2.2 19 N
31st
2.7 8.7 8.2 88 6.4 0.2 999.8 fq 6.1 7.1 34 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 50% 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