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January 2007 daily and monthly summary

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JANUARY 2007
February 2007


Note
A total hosepipe and sprinkler ban is in effect in South East Water & Mid Kent Water supply areas until further notice.
1st - 5th
After overnight squalls, fine sunny start to 2007, showers from a trough late pm with one lightning flash observed with thunder. A bright day on the 2nd with some sunshine, but the 3rd was dull. The 4th and 5th largely dry and feeling mild as the strength of the wind slackens, with some brightness.
6th - 13th
Mostly overcast and dull with heavy rain showers late pm 6th. Increasingly windy but very mild. Squalls again in the early am of the 10th from a cold front. Rather severe storm on the 11th causes disruption from high winds and flooding over much of the UK. Passage of weak cold front late on the 13th.
14th - 20th
A ridge of HP over northern France gives a rare sunny day on the 14th and a bright day on the 15th, but back to gloomy and damp weather on the 16th with rain and drizzle from late morning to early afternoon. Becoming windy and wet again as depressions track across the UK. Severe storm starting in the early hours of the 18th and continuing into the afternoon results in many fatalities across the UK. Much damage with widespread power cuts and travel disruption. Still very gusty overnight on the 19th and 20th although the daylight hours were dry, bright and less windy. Passage of cold front around dawn on the 20th.
21st - 26th
Becoming colder gradually, as Polar Maritime then Arctic Maritime air tracks from the north. Rain showers on 22nd and 23rd followed by approx 2 hours snowfall before dawn on the 24th leaving a covering of around 12mm. More snow and wintry showers on 25th and 26th but no accumulation.
27th - 31st
The brief cold spell ends with HP to the W and the wind backing to a less cold Returning Polar Maritime source. A dry and calm end to the month, with a mixture of cloudy and brighter weather.

 JANUARY 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 9.5
ºc 
 ( +2.4 )*
 Average Minimum 5.4
ºc 
 ( +2.7 )*
 Monthly Mean 7.4
ºc 
 
 Highest Maximum 13.5
ºc 
 (18th)
 Lowest Minimum -2.0
ºc 
 (26th)
 Days Min<= 0 ºC 4
 
 Days Max < 5 ºC 4
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -6.9
ºc 
 (23rd)
 Low Heat Index (THW) -2.3
ºc 
 (23rd)
 High Heat Index (THW) 12.3
ºc 
 (19th)
 High Sun Index (THSW) 16.1
ºc 
 (31st)
    
 
 RAINFALL
 Monthly Total 59.9
 mm
(77%)*
 Rainy Days (=>0.2mm) 20
( +2 )
 Inc days =>1mm) 13
 
 Dry Days 11
( -2 )
 Highest Daily Total 9.4
 mm
 (17th)
 Highest Rain Rate 28.4
 mm/hr
 (17th)
 Days with snowfall 3
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 1.1
 mm (20th)
 Monthly Total 19.7
 mm
 WIND
 Monthly Average 3.9  mph  
 Highest Gust 40  mph (18th)
 Dominant Directions SSW  (62%)
W  (11%)
NNW  (  6%)
WSW  (  5%)
   
     
 SUNSHINE†
 Sunniest Day
3.5
 hrs (31st)
 Monthly Sunshine
27.4
 Hours
 Peak Solar Rad.
436
 w/m² (29th)
 Total Solar Energy
1260
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 4.6 ºc
 Highest Reading 10.1 ºc   (  8th)
 Lowest Reading -5.1 ºc   (24th)
 RELATIVE HUMIDITY
 Average at 14.00h 75 %
 Lowest Reading 53 % (21st)
 Monthly Average 79 %
 BAROMETER
 Monthly Mean 1016.3  hPa  
 Highest Reading 1033.5  hPa (27th)
 Lowest Reading 987.9  hPa (18th)
‡ 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 50 - 60% of total possible sunshine exposure this month. 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.
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 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
5.4 9.3 64 2.7 1.2 1015.4 f 6.6 4.3 27 SSW
2nd
3.9 8.9 62 1.9 0.3 1022.4 rs 0.3 3.3 22 W
3rd
4.7

11.0

82 7.4 0.0 1020.0 f 0.8 5.8 32 SSW
4th
8.3 10.4 67 4.5 1.4 1012.1 rs 0.3 4.1 21 SSW
5th
7.2 11.4 84 8.4 0.1 1016.2 fs 0.0 3.5 20 SSW
6th
3.8 10.8 90 9.0 0.0 1008.7 fq 5.6 2.2 24 SSW
7th
5.6 10.5 79 6.9 0.0 1010.0 f 2.5 6.2 22 SSW
8th
6.6 12.4 87 7.2 0.0 998.4 fq 3.6 5.4 27 SSW
9th
11.6 12.7 83 9.3 0.0 1005.4 rs 0.3 9.5 32 SSW
10th
9.5 12.8 68 3.1 0.8 1011.4 rq 3.0 6.3 32 SSW
11th
4.9 12.6 86 8.6 0.3 1005.3 st 3.0 8.0 36 SSW
12th
7.7 12.6 77 8.5 0.1 1018.9 f 0.0 6.3 29 SSW
13th
9.8 11.4 78 7.5 0.0 1015.6 f 0.8 6.1 26 SSW
14th
4.7 9.9 59 2.2 3.2 1029.2 fs 0.0 2.2 14 SSW
15th
2.7 9.3 69 3.5 2.1 1020.6 f 0.0 2.5 20 SSW
16th
9.0 10.5 89 8.1 0.0 1013.6 f 2.8 5.1 22 SSW
17th
10.4 11.4 84 6.4 0.8 1004.8 st 9.4 6.0 29 SSW
18th
8.5 13.5 70 8.1 0.3 989.2 rs 8.4 9.2 40 SSW
19th
10.7 12.6 69 6.8 1.6 1017.5 rs 0.0 5.4 29 SSW
20th
8.2 10.0 59 2.2 2.4 1011.7 rs 2.3 6.5 32 SSW
21st
4.9 7.9 55 -0.7 2.8 1011.8 rs 0.0 4.7 28 SSW
22nd
-0.6 4.1 88 0.9 0.0 1016.9 r 6.3 1.2 17 NNW
23rd
0.4 2.6 73 -1.9 0.8 1017.5 f 0.3 3.4 19 NNW
24th
-1.4 2.9 88 0.1 0.4 1010.7 st 1.0 0.4 12 NNW
25th
-0.3 1.6 89 -0.2 0.3 1026.8 st 1.8 0.2 11 NNW
26th
-2.0 5.2 82 1.9 0.5 1022.3 f 0.8 0.4 10 SSW
27th
2.7 8.7 65 2.4 2.4 1032.0 st 0.0 0.4 10 SSW
28th
4.3 9.1 68 2.9 1.3 1026.8 f 0.0 1.8 14 SSW
29th
6.4 10.5 73 5.4 0.9 1026.4 fs 0.0 0.2 7 NNW
30th
6.6 8.0 85 5.5 0.0 1024.9 f 0.0 0.0 6 SSW
31st
2.3 10.2 64 3.4 3.5 1021.9 fs 0.0 1.2 14 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 less than 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