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DECEMBER 2007 daily and monthly summary

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DECEMBER 2007
January 2008
1st - 9th
Bright and breezy start to the month after passage of cold front previous night. LP moves across N England on 2nd bringing a series of fronts and troughs with rain and squalls. Very unsettled with light/moderate rain and gales early morning of 5th followed by heavy showers, with a repeat performance on the 6th. A quite day on the 7th after a windy and showery night. A very deep low with complex frontal structure approaches from the WNW of Ireland with a pressure fall of -10 hPa in 3 hours, bringing more light/moderate rain from mid-morning to late afternoon. LP moves across C England on the 9th bringing the lowest air pressure here for many years and a showery day.
10th - 16th
HP builds from the W with a rise of over +50 hPa in 48 hours. Cloudy and breezy on the 10th but becoming calmer with sunny periods from the 11th. HP lies over SE England to Denmark giving largely clear skies until the 14th, when anticyclonic gloom takes over. Sunny day 16th.
17th - 23rd
HP drifts SSE, 17th is cloudy with a chilly wind, mostly sunny on the 18th, early fog 19th then sunny. Freezing fog helps keep temperature subzero on 21st, first "ice day" since Dec 2005. Freezing fog again on 23rd.
24th - 31st
HP to the SW and SE, two deep lows to the NW. As the temperature rises it becomes unsettled again. Christmas Day is very gloomy and rainy as fronts cross the UK. Boxing Day is bright and sunny before gloom returns with rain from evening of 28th and overnight. Dry and mild but mostly cloudy conditions to finish the year.
DECEMBER 2007 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
7.4
  ºC ( -0.4C )*
 Daily Minimum
 3.0
  ºC ( -0.6C )*
 Daily Mean
5.0
  ºC ( -0.5C )*
 EXTREMES
 High Maximum
13.8
  ºC (  6th)
 Low Minimum
-5.3
  ºC (20th)
 Low Maximum
-0.1
  ºC (21st)
 High Minimum
12.0
  ºC (  5th)
 
   
 Days with Air Frost
10
    
 Days with max > 10º
8
    
 No of Ice Days (max <0°)
1
    
 
PRECIPITATION
 Monthly Total
46.1
  mm ( 63% )*
 Days with measurable precip
14
  Days ( -2 )*
   ...of which, days with >= 1.0 mm
9
  Days  
   ...and days with snowfall observed
0
  Days  
 Days with Snow Cover
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
64.8
  mm/hr (2nd)
 High Rain Total in 1 day
8.6
  mm (2nd)
 High Rain Total in 1 hour
3.8
  mm (2nd, 12.15h)
 EVAPO-TRANSPIRATION
 Total for month
13.6
  mm  
 High Total for 1 day
0.9
  mm (1st)
APPARENT TEMPERATURE
 Low Wind Chill
-5.3
  ºC (20th)
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-5.4
  ºC (20th)
 High Temp/Hum/Wind Index
13.4
  ºC (6th)
 High Temp/Hum/Sun/Wind Index
12.8
  ºC (2nd)
 
DEWPOINT & HUMIDITY
 High Dewpoint
11.9
  ºC (  6th)
 Low Dewpoint
-7.2
  ºC (20th)
 Average Dewpoint at 14h
3.5
  ºC  
 Low Relative Humidity
58
  % (  1st)
 Average RH at 14h
79
  %  
WIND SPEED & DIRECTION
 Monthly Average
2.6
  mph  
 Windiest day (Average)
7.1
  mph (5th)
 Highest Gust
29
  mph (2nd)
 Dominant Direction
SSW
  (29%)
 
BAROMETER
 Monthly Mean
1019.7
  hPa  
 High Barometer
1040.7
  hPa (13th)
 Low Barometer
976.6
  hPa (  9th)
SUNSHINE
 Max Sensor Exposure to direct sun
<2
  hours/day (8 possible)
 Calculated Monthly Sunshine Hours
17.5
  hours  
 Estimated Actual Hours (approx)
53
  hours  
 Sunniest Day Measured
1.5
  hours (12th)
 Days with no sunshine
11
  Days  
 
FOG
 Number of Days with Fog
3
  Days  
NEW RECORDS SET THIS MONTH
 
   DAILY STATS DECEMBER 2007
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(09-21h)
RH %
at 14.00
Dewpoint ºc
at 14.00
Bright
sun hrs
hPa   †
at 14.00
Day Total
(mm)
Average
(mph)
High Gust
(mph)
Dominant
(Compass)
                   
1st
 6.3 10.2 62 3.2 0.7 1001.3 fs 0.0 5.8 24 SSW
2nd
 7.4 11.9 76 7.5 0.4 986.3 f 8.6 6.7 29 SSW
3rd
 5.9 9.3 68 3.4 0.6 1003.1 st 0.0 3.2 20 W
4th
 6.0 13.5 87 10.2 0.1 1013.7 fs 0.0 3.9 22 SSW
5th
 12.0 12.5 82 9.5 0.1 1004.8 fs 6.9 7.1 26 SW
6th
 9.1 13.8 89 11.8 0.0 1004.3 f 7.1 7.0 27 SW
7th
 8.2 9.9 67 3.9 0.7 1000.9 rs 0.5 4.5 28 W
8th
 3.9 12.0 89 5.7 0.0 990.8 fq 6.1 4.0 22 SSW
9th
 5.7 8.7 81 5.3 0.3 976.7 f 3.8 4.2 20 SSW
10th
 5.7 6.8 72 2.1 0.0 1012.3 rq 1.0 5.2 22 N
11th
 1.2 5.8 60 -1.4 1.3 1030.7 rs 0.0 0.5 8 N
12th
 -3.3 4.0 89 2.4 1.5 1037.1 st 0.3 0.0 2 SW
13th
 -3.1 3.8 90 2.2 1.5 1039.9 fs 0.0 0.1 10 SW
14th
 0.7 4.6 84 1.9 0.0 1037.5 f 0.0 0.2 8 SE
15th
 2.2 2.8 68 -2.6 0.1 1033.8 fs 0.0 0.8 14 SE
16th
 -1.2 3.3 67 -2.2 1.5 1035.9 fs 0.0 0.2 11 ESE
17th
 -2.1 4.9 76 -1.3 0.0 1032.1 fs 0.3 1.5 16 ESE
18th
 -2.0 4.6 73 0.1 1.0 1035.4 fs 0.0 0.4 12 ESE
19th
 -2.2 2.9 84 0.5 1.5 1036.4 fs 0.0 0.1 10 SE
20th
 -5.3 3.2 89 1.5 1.5 1031.7 f 0.0 0.1 3 SE
21st
 -3.0 -0.1 92 -1.3 1.0 1024.6 f 0.0 0.0 3 ESE
22nd
 -2.9 4.6 92 1.6 0.0 1022.7 fs 0.0 0.0 3 E
23rd
 -1.8 2.6 93 0.7 0.0 1027.5 f 0.3 0.0 3 WSW
24th
 1.9 8.7 84 5.9 0.3 1021.9 f 0.0 2.8 16 SSW
25th
 7.9 9.2 90 7.0 0.0 1011.1 fs 3.8 3.1 17 SW
26th
 1.9 8.5 92 5.9 1.5 1025.7 rs 0.0 1.1 13 SSW
27th
 8.3 11.8 81 8.7 0.0 1025.0 st 0.3 5.9 21 SSW
28th
 9.0 10.1 77 5.9 0.0 1018.0 f 3.3 6.9 25 SW
29th
 5.6 8.2 63 1.5 1.3 1011.1 fs 3.8 5.2 28 SSW
30th
 6.0 9.1 63 2.2 0.7 1026.8 st 0.0 0.8 10 SSW
31st
 4.8 8.0 84 5.3 0.0 1028.0 fs 0.0 0.1 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 75% 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