Tonbridge-Weather.org.uk

2011 Yearly summary


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This page contains the yearly/monthly summaries for 2011 and links to each month for daily readings.

2011 YEARLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum 15.6  ºC ( +0.9C )*
 Daily Minimum 7.9  ºC ( +0.6C )*
 Daily Mean Simple (Max+Min)/2 11.76  ºC (+0.79C )*
 EXTREMES
 High Maximum
31.3
 ºC ( 27 Jun )
 Low Minimum -3.7  ºC (  8 Mar )
 Low Maximum
2.6
 ºC (  3 Jan )
 High Minimum
17.4
 ºC ( 28 Jun )
 
   
 Days with max > 25 º
20
  ( ±0 )*
 Days with Air Frost
16
  ( -15 )*
 Days with max < 0 º ("Ice days")
0
  ( -2 )*
 
PRECIPITATION
 Yearly Total
497.5
 mm ( 72% )*
 Days with measurable precip
152
 Days ( -10 )*
   ...of which, days with >= 1.0 mm
90
 Days ( -32 )*
   ...and days with snowfall observed
3
 Days  
 Days with Snow Cover
0
 Days  
 Days with Thunder
4
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
102
 mm/hr ( 25 Oct )
 High Rain Total in 1 day
24.9
 mm ( 17 Jan )
 High Rain Total in 1 hour
7.1
 mm ( 28 Jun )
 EVAPO-TRANSPIRATION
 Total for Year
664.8
 mm  
 High Total for 1 day
4.8
 mm ( 26 Jun )
APPARENT TEMPERATURE
 Low Wind Chill
-3.9
 ºC ( 1 Feb )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-4.0
 ºC (   1 Feb )
 High Temp/Hum/Wind Index
30.4
 ºC ( 27 Jun )
 High Temp/Hum/Sun/Wind Index
36.3
 ºC ( 27 Jun )
 
DEWPOINT & HUMIDITY
 High Dewpoint
18.8
 ºC ( 28 Jun )
 Low Dewpoint
-7.6
 ºC (  4 May )
 
   
 Low Relative Humidity
20
 % (  4 May)
 
   
WIND SPEED & DIRECTION
 Yearly Average
2.0
 mph  
 Windiest day (Average)
8.9
 mph (   4 Feb )
 Highest Gust
31
 mph ( 13 Dec )
 Dominant Direction
SW
 ( 34% )
 
BAROMETER
 Yearly Mean
1015.0
 hPa  
 High Barometer
1040.3
 hPa ( 23 Mar )
 Low Barometer
975.4
 hPa ( 16 Dec )
SUNSHINE
 Max Sensor Exposure to direct sun
2 - 10
 hrs/day (8-16 in theory)
 Calculated Yearly Sunshine Hours
1203
 hours  
 Estimated Actual Hours (approx)
1570
 hours  
 Sunniest Month Actual Hours
235
 hours ( April )
 Days with no sunshine
57
 Days  
 
FOG
 Number of Days with Fog
33
 Days  
NOTABLE SITE RECORDS SET THIS YEAR
  • Warmest month of April since recording started at this site
  • Driest spring trimester ( Mar/Apr/May ) since recording started at this site
  • Driest autumn trimester ( Sep/Oct/Nov ) since recording started at this site


* Compared to site average 1985 - 2010


YEAR 2011 - 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  
3.7 7.0 5.09 -2.6 12.6 40 95.9 22 2.1 / SW 30
FEBRUARY  
4.8 9.2 6.95 -2.2 15.2 42 42.3 15 2.5 / SW 29
MARCH  
3.3 12.3 6.97 -3.7 18.7 133 11.7 5 1.4 / N    25
APRIL  
7.6 19.5 12.96 2.5 28.7 235 1.1 2 1.5 / N    24
MAY  
8.5 18.3 13.08 2.8 23.9 227 10.2 5 2.3 / SW 28
JUNE  
10.5 19.6 14.74 5.3 31.3 192 74.2 18 2.4 / SW 25
JULY  
9.9 20.7 15.77 8.3 26.3 165 42.1 13 1.9 / SW 25
AUGUST  
12.7 20.9 16.24 9.2 28.6 148 43.3 12 1.8 / SW 24
SEPTEMBER  
11.7 20.7 15.42 5.8 28.6 146 29.7 10 2.5 / SW 29
OCTOBER  
9.3 17.0 12.70 0.2 29.1 131 31.0 9 2.0 / SW 25
NOVEMBER  
7.1 12.6 9.69 -0.8 17.3 50 32.4 19 1.3 / SE  26
DECEMBER  
4.6 8.9 6.72 -1.9 12.3 61 83.6 20 2.8 / SW 31
Year  
    11.36 -3.7 31.3 1570 497.5 150 2.0 / SW 31

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