Tonbridge-Weather.org.uk

2009 Yearly summary

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This page contains the monthly summaries for 2009 and links to daily readings.

YEAR 2009 - MONTHLY SUMMARY  
Click on month
name for daily stats
Monthly Ave Temperature ºc
Monthly Low / High ºc
 Sun*
Monthly Rainfall
Wind (mph)
Min Max Mean Min Max Hrs* Total
(mm)		 Wet
Days		 Ave Speed / Dir High
Gust
JANUARY  
 0.4 5.2 2.69 -7.7 9.7 60.0 78.0 18 1.7 / SW 30
FEBRUARY  
 1.8 7.4 4.35 -6.6 14.5 62.0 58.0 14 1.1 / N    29
MARCH  
 3.3 12.0 7.13 -1.7 16.8 150.0 32.6 12 2.2 / SW 39
APRIL  
 6.5 16.3 10.88 1.4 22.8 170.0 38.3 12 1.3 / SW 21
MAY  
 8.8 18.2 13.18 3.4 24.4 194.0 25.8 10 2.4 / SW 26
JUNE  
 11.6 22.2 16.23 5.9 30.6 212.0 21.6 8 1.3 / SW 20
JULY  
 13.3 22.0 16.97 9.9 31.3 185.0 64.0 19 2.7 / SW 26
AUGUST  
 13.4 23.2 17.78 8.7 30.1 185.0 22.1 8 1.8 / SW 22
SEPTEMBER  
 11.6 20.2 15.26 6.1 27.2 152.0 24.3 7 1.7 / N   26
OCTOBER  
 8.8 15.4 11.62 2.3 18.2 103.0 51.3 15 1.3 / SW 25
NOVEMBER  
 7.4 11.7 9.48 1.8 16.1 60.0 181.8 27 3.5 / SW 44
DECEMBER  
 1.6 5.6 3.72 -7.4 12.3 58.0 72.1 25 1.6 / SW 29
Year  
     10.80 -7.7 31.3 1591.0 669.9 175 1.9 / SW 44

BOLD signifies new site record for the month since recording began
* Total bright sunshine hours estimated from limited daily exposure solar radiation readings

2009 YEARLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
14.9
  ºC ( +0.2C )*
 Daily Minimum
7.3
  ºC ( -0.1C )*
 Daily Mean
10.80
  ºC ( c. +0.15C )
 EXTREMES
 High Maximum
31.3
  ºC (  2 July )
 Low Minimum
-7.7
  ºC ( 10 Jan )
 Low Maximum
-1.7
  ºC ( 10 Jan )
 High Minimum
18.4
  ºC ( 28 Jun )
 
   
 Days with Air Frost
41
   ( +11 )*
 Days with max > 25 º
17
   ( -4 )*
 Days with max < 0 º ("Ice days")
2
   ( +1 )*
 
PRECIPITATION
 Yearly Total
669.9
  mm ( 96% )*
 Days with measurable precip
175
  Days ( +16 )*
   ...of which, days with >= 1.0 mm
119
  Days ( -4 )*
   ...and days with snowfall observed
10
  Days  
 Days with Snow Cover
9.5
  Days  
 Days with Thunder
8
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
120.0
  mm/hr (  7 Jun )
 High Rain Total in 1 day
35.1
  mm ( 13 Nov )
 High Rain Total in 1 hour
10.4
  mm ( 13 Nov )
 EVAPO-TRANSPIRATION
 Total for Year
675.5
  mm  
 High Total for 1 day
4.9
  mm ( 30 Jun )
APPARENT TEMPERATURE
 Low Wind Chill
-7.7
  ºC ( 10 Jan )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-9.0
  ºC ( 10 Jan )
 High Temp/Hum/Wind Index
31.3
  ºC ( 2 July )
 High Temp/Hum/Sun/Wind Index
37.9
  ºC ( 2 July )
 
DEWPOINT & HUMIDITY
 High Dewpoint
17.4
  ºC ( 2 July )
 Low Dewpoint
-11.6
  ºC ( 6 Jan )
 Average Dewpoint at 14h
6.4
  ºC  
 Low Relative Humidity
25
  % ( 18 Mar )
 Average RH at 14h
62
  %  
WIND SPEED & DIRECTION
 Yearly Average
1.9
  mph  
 Windiest day (Average)
8.3
  mph ( 18 Nov )
 Highest Gust
44
  mph ( 14 Nov)
 Dominant Direction
SW
  ( % )
 
BAROMETER
 Yearly Mean
1012.7
  hPa  
 High Barometer
1035.9
  hPa ( 11 Sep )
 Low Barometer
963.8
  hPa ( 23 Jan )
SUNSHINE
 Max Sensor Exposure to direct sun
10
  hours/day (15.5 possible)
 Calculated Yearly Sunshine Hours
1257.6
  hours  
 Estimated Actual Hours (approx)
1591.0
  hours  
 Sunniest Day Measured
9.7
  hours ( 1 July )
 Days with no sunshine
39
  Days  
 
FOG
 Number of Days with Fog
22
  Days  
NOTABLE SITE RECORDS SET THIS YEAR
  • Highest number of rain days for any calendar month ( 27 in November )
  • Highest wind speed gust ( 44 mph, 14 November )