Rothamsted Research

where knowledge grows

Yearly Weather Summaries

Data supplied from the Rothamsted Meteorological Station

Change of rain gauge and the effect on rainfall capture and data presented in Monthly Weather Summaries.

Rainfall up until 2004 was measured manually using a cylindrical rain gauge of five inch diameter (5") within a turf-wall enclosure to reduce wind turbulence. In 2004 the Met Station at Rothamsted was automated and the 5" rain gauge replaced with an aerodynamically shaped tipping bucket rain gauge of ten inch diameter (type ARG100) within the enclosure. The manufacturers of the ARG100 state that "the ARG100 raingauge typically captures over 5% more rainfall than most traditionally-shaped cylindrical gauges due to its unique aerodynamic shape and reduced evaporation-loss properties". This has been found to be the case at Rothamsted. When we have compared the ARG100 with the 5" we get a difference of approximately ten percent over an eight year period (2004 to 2011).

We have therefore decided not to correct rainfall data but to advise that this difference exists. This does however mean that the 30 year average rainfall data are to be considered for use as guidance only.

Table of warnings about 30 year rainfall averages
 
30 Year Average
(Gauge used)
Associated Weather Summary Table Status
1971 to 2000 (5" only) 2001 to 2010 up to 2003 - OK
2004 onwards - guidance only
1981 to 2010 (5" and ARG100) 2011 onwards guidance only

| 2001 | 2002 | 2003 | 2004 | 2005 | 2006| 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015| 2016


Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2016
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 64.5 (+2.46) 8.1 (+1.36) 1.8 (+0.63) 16 4.3 6.5 92.3 (+22.34) 25
February 111.5 (+31.19) 8.0 (+1.09) 1.6 (+0.67) 18 3.6 5.9 46.9 (-3.27) 18
March 133.4 (+18.45) 9.2 (-0.65) 1.8 (-0.92) 18 4.4 6.2 84.3 (+33.52) 16
April 167.6 (+6.37) 11.9 (-0.73) 3.5 (-0.52) 12 7.2 8.8 62.0 (+6.96) 24
May 197.0 (+2.40) 17.4 (+1.34) 7.9 (+0.99) 7 13.0 12.4 39.4 (-15.30) 11
June 141.0 (-57.17) 19.0 (-0.11) 11.2 (+1.45) 0 15.8 15.5 84.8 (+31.58) 22
July 210.3 (+5.09) 22.2 (+0.43) 12.8 (+0.89) 0 18.3 17.3 27.1 (-22.80) 16
August 217.6 (+21.38) 22.7 (+1.17) 12.9 (+1.02) 0 17.8 17.1 30.1 (-33.58) 12
September 128.0 (-15.44) 20.4 (+2.10) 12.2 (+2.29) 0 15.8 16.5 70.3 (+12.68) 16
October 104.0 (-7.73) 14.2 (+0.18) 7.4 (+0.30) 4 10.3 12.4 30.1 (-51.55) 22
November 91.1 (+20.40) 8.8 (-0.94) 2.6 (-1.24) 11 5.8 8.6 85.7 (+9.04) 21
December 68.7 (+14.91) 8.7 (+1.77) 2.1 (+0.40 18 4.8 6.7 26.2 (-43.28) 24
                         
Year 1634.6 (+42.31) 14.2 (+0.58) 6.5 (+0.50) 104 10.1 11.2 679.3 (-53.66) 227
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2015
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 90.6 (+28.51) 7.5 (+0.76) 0.9 (-0.32) 17 5.0 7.2 81.9 (+11.93) 25
February 85.6 (+5.31) 6.7 (-0.21) 0.8 (-0.17) 18 2.4 4.1 54.6 (+4.42) 21
March 158.9 (+43.99) 10.2 (+0.27) 2.9 (+0.27) 15 5.4 6.2 26.1 (-24.67) 16
April 231.7 (+70.50) 14.5 (+1.85) 4.2 (+0.13) 15 8.8 9.6 31.0 (-24.05) 14
May 203.4 (+8.79) 15.6 (-0.53) 7.0 (+0.12) 6 11.9 12.3 68.4 (+13.75) 19
June 227.9 (+29.77) 19.5 (+0.33) 9.2 (-0.58) 3 15.5 14.7 26.7 (-26.55) 12
July 210.4 (+5.20) 21.4 (-0.40) 11.7 (-0.15) 0 16.4 16.9 132.6 (+82.71) 17
August 141.2 (-55.00) 20.5 (-1.10) 12.1 (+0.29) 0 16.4 16.6 83.2 (+19.49) 15
September 154.4 (+10.96) 16.9 (-1.38) 8.45 (-1.47) 4 12.3 14.7 45.5 (-12.18) 20
October 94.2 (-17.50) 14.2 (+0.16) 7.8 (+0.71) 5 10.4 12.4 64.6 (-17.04) 21
November 46.4 (-24.30) 12.3 (+2.57) 6.6 (+2.79) 5 8.7 10.9 84.0 (+7.40) 26
December 48.2 (-5.60) 12.5 (+5.56) 7.3 (+5.66) 3 8.4 9.5 81.8 (+12.29) 24
                         
Year 1692.9 (+100.64) 14.3 (+0.66) 6.6 (+0.59) 91 10.1 11.1 780.5 (+47.50) 193
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page


 
Rothamsted Research
The weather : Monthly Summary : 2014
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 59.9 (-2.10) 8.5 (+1.83) 2.9 (+1.66) 9 4.4 5.8 176.2 (+106.18) 28
February 93.1 (+12.88) 9.0 (+2.07) 3.2 (+2.31) 13 4.2 5.5 141.9 (+91.80) 23
March 180.8 (+65.91) 12.7 (+2.84) 3.4 (+0.73) 12 5.8 7.2 28.2 (-22.57) 16
April 162.7 (+1.51) 14.8 (+2.19) 6.1 (+2.12) 3 9.8 10.3 31.5 (-23.54) 14
May 173.6 (-20.98) 16.5 (+0.41) 8.3 (+1.39) 2 12.7 13.0 82.8 (+28.14) 18
June 227.7 (+29.53) 20.2 (+1.01) 10.6 (+0.88) 0 16.9 16.1 30.5 (-22.77) 14
July 233.4 (+28.25) 23.9 (+2.11) 13.3 (+1.40) 0 19.1 17.8 36.9 (-13.00) 14
August 168.9 (-27.38) 19.9 (-1.59) 11.4 (-0.44) 0 16.1 16.7 113.3 (+49.59) 22
September 118.9 (-24.46) 20.1 (+1.85) 11.6 (+1.71) 0 15.6 15.9 14.8 (-42.81) 13
October 98.9 (-12.84) 16.0 (+1.97) 9.8 (+2.63) 4 12.0 13.5 95.7 (+14.05) 24
November 56.3 (-14.48) 11.3 (+1.53) 5.9 (+2.06) 9 8.2 10.4 108.2 (+31.57) 27
December 94.7 (+40.85) 8.1 (+1.20) 2.1 (+0.41) 17 4.6 6.9 64.0 (-5.57) 24
                         
Year 1669.0 (+76.69) 15.1 (+1.45) 7.4 (+1.40) 69 10.8 11.6 924.1 (+191.13) 237
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2013
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 44.8 (-17.23) 4.9 (-1.78) 0.5 (-0.70) 18 3.4 5.2 62.8 (-7.17) 16
February 86.1 (+5.81) 5.2 (-1.75) 0.2 (-0.74) 16 2.0 4.1 43.4 (-6.74) 18
March 72.9 (-42.00) 5.2 (-4.71) -0.16 (-2.83) 19 3.3 4.2 83.1 (+32.30) 15
April 193.7 (+32.53) 12.2 (-0.45) 3.0 (-1.05) 13 6.4 6.8 32.8 (-22.29) 15
May 183.2 (-11.44) 14.8 (-1.32) 6.2 (-0.72) 6 10.9 10.9 56.0 (+1.28) 15
June 185.3 (-12.89) 18.0 (-1.10) 9.3 (-0.45) 1 14.5 13.6 24.6 (-28.69) 9
July 277.3 (+72.09) 24.5 (+2.71) 12.8 (+0.93) 0 19.5 17.2 47.4 (-2.48) 12
August 191.2 (-5.04) 22.1 (+0.49) 12.7 (+0.88) 0 17.4 17.3 57.5 (-6.23) 14
September 122.7 (-20.67) 17.8 (-0.53) 9.7 (-0.20) 0 13.5 15.0 50.2 (-7.39) 21
October 84.7 (-27.05) 15.3 (+1.21) 9.3 (+2.15) 2 11.5 13.1 108.8 (+27.07) 26
November 77.9 (+7.13) 8.9 (-0.85) 3.6 (-0.24) 9 5.9 8.7 59.5 (-17.13) 23
December 62.1 (+8.33) 9.1 (+2.22) 2.6 (+0.92) 16 4.8 6.7 123.1 (+53.60) 24
                         
Year 1581.9 (-10.43) 13.2 (-0.49) 5.8 (-0.17) 100 9.4 10.2 749.1 (+16.13) 208
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2012
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 82.2 (+20.18) 8.4 (+1.75) 2.5 (+1.26) 13 4.2 6.1 58.0 (-11.97) 20
February 109.3 (+29.03) 6.4 (-0.50) 0.1 (-0.85) 15 2.6 4.1 24.7 (-25.44) 8
March 193.5 (+78.61) 12.8 (+2.94) 3.1 (+0.40) 22 6.1 7.6 34.7 (-16.13) 16
April 150.1 (-11.14) 11.5 (-1.11) 3.3 (-0.69) 14 8.1 8.9 168.6 (+113.57) 25
May 175.6 (-19.06) 16.1 (+0.05) 7.9 (+1.02) 4 11.8 11.9 52.6 (-2.08) 14
June 144.9 (-53.31) 17.6 (-1.51) 10.0 (+0.27) 3 14.2 14.6 166.5 (+113.21) 22
July 172.3 (-32.86) 19.8 (-1.96) 11.6 (-0.25) 0 16.4 16.8 128.4 (+78.57) 23
August 176.5 (-19.77) 21.8 (+0.18) 12.8 (+0.91) 0 17.2 17.4 54.9 (-8.82) 16
September 179.6 (+36.20) 18.3 (+0.01) 8.4 (-1.53) 1 13.3 14.9 40.4 (-17.27) 15
October 86.0 (-25.71) 12.7 (-1.36) 6.6 (-0.47) 8 9.3 12.0 115.8 (+34.13) 26
November 76.9 (+6.91) 9.4 (-0.32) 3.6 (-0.23) 13 5.8 8.6 100.4 (+23.79) 12
December 68.2 (+14.40) 7.5 (+0.64) 1.4 (-0.24) 15 4.2 5.3 114.2 (+44.67) 26
                         
Year 1615.0 (+22.68) 13.5 (-0.10) 5.9 (-0.03) 108 9.3 10.7 1059.2 (+326.23)

233

                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2011
(Departure from the 30 year means (1981 - 2010) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 45.4 (-16.60) 6.0 (-0.68) 1.6 (+0.40) 16 3.3 4.6 86.4 (+14.63) 21
February 48.7 (-31.56) 8.8 (+1.89) 3.6 (+2.72) 8 4.8 5.6 56.8 (+6.66) 21
March 149.6 (+34.68) 10.7 (+0.85) 2.4 (-0.32) 15 5.1 6.2 10.0 (-40.80) 12
April 234.4 (+73.14) 17.6 (+4.98) 6.7 (+2.67) 4 10.4 10.8 5.2 (-49.86) 4
May 237.6 (+43.01) 17.4 (+1.32) 7.6 (+0.72) 4 13.1 12.8 23.6 (-31.09) 11
June 214.3 (+16.13) 19.0 (-0.14) 9.6 (-0.21) 1 15.0 14.7 83.0 (+29.74) 16
July 171.2 (-33.98) 19.9 (-1.83) 10.9 (-1.02) 0 16.2 16.1 44.6 (-5.27) 14
August 141.2 (-55.04) 19.9 (-1.67) 11.7 (-0.14) 0 15.8 16.3 81.2 (+17.47) 20
September 160.3 (+16.88) 19.6 (+1.28) 11.1 (+1.14) 0 14.0 15.1 38.4 (-19.22) 19
October 143.2 (+31.46) 16.7 (+2.60) 9.0 (+1.95) 4 11.6 13.2 25.2 (-56.47) 17
November 68.8 (-1.92) 12.4 (+2.66) 6.2 (+2.44) 4 8.9 10.9 36.4 (-40.19) 23
December 74.5 (+20.66) 8.6 (+1.71) 2.82 (+1.16) 11

4.5

6.8 82.4 (+12.88)

23

                         
Year 1689.1 (+96.86) 14.7 (+1.08) 6.9 (+0.95) 67 10.2 11.1 571.5 (-161.51)

201

                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2010
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 65.8 (+10.76) 3.2 (-3.10) -0.9 (-1.74) 19 1.3 3.1 47.3 (-22.32) 18
February 55.6 (-15.08) 5.4 (-1.27) 0.3 (-0.47) 18 2.0 3.3 77.2 (+22.44) 25
March 145.7 (+38.52) 9.8 (+0.34) 2.5 (+0.19) 20 4.6 5.6 45.2 (-8.72) 16
April 222.5 (+75.68) 14.1 (+2.17) 3.8 (+0.15) 14 8.5 8.9 18.7 (-34.83) 10
May 205.4 (+10.49) 15.4 (-0.37) 5.7 (-0.62) 11 11.8 11.5 38.4 (-11.32) 9
June 240.8 (+50.48) 20.8 (+2.22) 10.3 (+1.09) 0 16.8 15.3 23.5 (-36.71) 10
July 179.4 (-23.95) 22.7 (+1.35) 13.2 (+1.86) 0 18.9 17.6 31.6 (-10.41) 14
August 140.3 (-56.48) 19.8 (-1.63) 11.7 (+0.39) 0 15.5 16.5 127.6 (+73.87) 21
September 133.2 (-9.16) 17.7 (-0.31) 10.0 (+0.51) 0 13.3 14.8 59.7 (-1.31) 16
October 99.6 (-12.59) 13.7 (-0.04) 7.2 (+0.60) 7 9.7 12.2 84.9 (+10.25) 22
November 60.5 (-9.62) 7.5 (-1.84) 2.7 (-0.60) 13 5.5 8.5 54.8 (-11.40) 21
December 38.4 (-9.70) 2.0 (-5.15) -2.7 (-4.6) 24 1.1 3.6 35.3 (-34.80) 16
                         
Year 1587.0 (+49.34) 12.7 (-0.64) 5.3 (-0.27) 126

9.1

10.1 644.2 (-59.29)

198

                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2009
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 76.2 (+21.15) 5.2 (-1.15) -0.8 (-1.62) 23 1.9 3.4 70.4 (+0.74) 21
February 85.0 (+14.31) 6.4 (-0.36) 1.0 (+0.26) 17 2.9 3.8 73.9 (+25.14) 14
March 182.0 (+74.81) 11.3 (+1.81) 2.4 (+0.11) 19 5.0 6.7 37.3 (-16.59) 18
April 184.7 (+37.92) 14.7 (+2.75) 5.3 (+1.73) 11 9.5 10.0 46.7 (-6.84) 16
May 242.1 (+47.24) 17.1 (+1.37) 7.7 (+1.34) 4 12.7 12.6 24.8 (-24.93) 13
June 208.3 (+18.02) 20.0 (+1.35) 10.2 (+0.94) 2 16.0 15.3 68.1 (+7.90) 13
July 199.7 (-3.63) 20.8 (-0.58) 12.3 (+0.95) 0 17.4 17.0 73.4 (+31.34) 19
August 185.2 (-11.62) 22.0 (+0.54) 12.7 (+1.34) 0 17.3 17.1 63.4 (+9.70) 13
September 144.7 (+2.35) 18.8 (+0.81) 10.6 (+1.19) 0 14.3 15.0 15.8 (-45.20) 9
October 79.9 (-32.24) 14.7 (+0.98) 8.0 (+1.32) 5 10.6 12.3 39.3 (-35.36) 19
November 77.0 (+6.89) 11.3 (+1.96) 6.0 (+2.62) 8 7.6 9.7 146.2 (+80.00) 27
December 72.4 (+24.33) 5.4 (-1.74) 0.0 (-1.92) 16 3.2 5.8 106.6 (+36.50) 27
                         
Year 1737.2 (+199.53) 14.0 (+0.65) 6.3 (+0.69) 105 9.9 10.7 765.9 (+62.40) 209
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2008
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 73.3 (+18.25) 9.3 (+2.93) 3.4 (+2.59) 11

5.0

6.2 103.2 (+33.54)

24

February 145.5 (+74.81) 9.7 (+3.02) 1.1 (+0.35) 20 3.3 5.2 21.9 (-26.83) 13
March 122.4 (+15.21) 9.3 (-0.21) 2.5 (+0.19) 15 4.7 6.4 108.5 (+54.61) 22
April 160.0 (+13.22) 12.2 (+0.32) 3.8 (+0.13) 14 7.4 8.5 53.5 (-0.04) 22
May 193.2 (-1.67) 18.0 (+2.24) 8.8 (+2.44) 5 13.1 12.8 87.0 (+37.27) 14
June 229.0 (+38.72) 18.8 (+0.22) 10.2 (+1.00) 1 15.9 15.7 35.3 (-24.90) 13
July 194.7 (-8.64) 20.9 (-0.51) 12.2 (+0.89) 0 17.1 16.6 88.2 (+46.10) 17
August 121.2 (-75.62) 20.1 (-1.37) 13.1 (+1.73) 0 16.4 17.0 107.8 (+54.10) 25
September 127.4 (-14.94) 17.1 (-0.86) 9.9 (+0.46) 1 13.4 15.5 66.2 (+5.20) 18
October 139.6 (+27.46) 13.6 (-0.16) 5.3 (-1.30) 14 8.7 11.9 74.3 (-0.36) 24
November 53.9 (-16.20) 9.5 (+0.10) 4.2 (+0.83) 10 6.2 8.5 91.1 (+24.90) 24
December 76.3 (+28.20) 5.9 (-1.25) 0.8 (-1.07) 21 3.1 5.3 42.0 (-28.10) 15
                         
Year 1636.5 (+98.81) 13.7 (+0.37) 6.3 (+0.69) 112 10.8 11.0 879.1 (+175.51) 231
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2007
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 71.4 (+16.40) 9.5 (+3.10)

4.0

(+3.20) 9 5.5 6.9 91.6 (+21.90)

26

February 89.2 (+18.51) 8.6 (+1.91) 2.9 (+2.13) 11 4.7 5.9 97.4 (+48.64) 23
March 177.1 (+69.91) 11.1 (+1.60) 2.9 (+0.60) 15 5.6 7.3 57.6 (+3.71) 20
April 239.2 (+92.42) 16.6 (+4.69) 5.7 (+2.12) 9 10.8 10.4 2.8 (-50.74) 9
May 160.1 (-34.77) 16.0 (+0.28) 8.1 (+1.77) 2 13.2 13.0 135.8 (+86.07) missing
June 151.5 (-38.78) 19.2 (+0.58) 11.3 (+2.07) 0 16.4 16.0 72.4 (+12.20) 18
July 174.8 (-28.54) 19.7 (-1.75) 11.9 (+0.58) 0 16.5 16.8 86.8 (+44.74) 22
August 193.5 (-3.32) 20.0 (-1.44) 11.1 (-0.20) 0 16.5 16.8 64.4 (+10.70) 16
September 153.6 (+11.26) 18.0 (+0.05) 10.0 (+0.61) 0 14.4 15.6 29.2 (-31.80) 14
October 99.6 (-12.54) 14.0 (+0.31) 7.1 (+0.48) 7 10.2 12.5 57.1 (-17.56) 18
November 92.3 (+22.20) 10.1 (+0.69) 3.5 (+0.13) 12 6.1 8.7 80.0 (+13.80) 21
December 76.9 (+28.80) 7.6 (+0.41) 2.0 (+0.04) 12 4.0 6.0 67.1 (-3.00) 18
                         
Year 1679.2 (+141.51) 14.2 (+0.87) 6.72 (+1.13) 77 10.3 11.3 842.2 (+138.70) 205
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2006
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 58.0 (+3.0) 6.2 (-0.2) 1.8 (+1.0) 15 3.8 5.1 29.2 (-40.5) 19
February 80.2 (+9.5) 5.7 (-1.0) 0.6 (-0.2) 18 3.0 4.4 41.4 (-7.4) 14
March 115.2 (+8.0) 7.9 (-1.6) 1.5 (-0.8) 16 3.7 4.6 49.5 (-4.4) 13
April 141.8 (-5.0) 12.5 (+0.5) 4.5 (+0.9) 8 8.2 8.6 51.0 (-2.5) 21
May 161.6 (-33.3) 16.4 (+0.7) 8.3 (+2.0) 1 12.9 13.1 89.0 (+39.3) 22
June 265.9 (+75.6) 21.6 (+3.0) 10.7 (+1.5) 0 17.6 16.5 15.0 (-45.2) 9
July 275.1 (+71.8) 26.1 (+4.7) 14.5 (+3.1) 0 20.7 18.9 35.6 (-6.5) 12
August 154.2 (-42.6) 20.3 (-1.1) 12.4 (+1.0) 0 16.6 17.4 110.0 (+56.3) 22
September 154.2 (+11.9) 21.3 (+3.4) 13.4 (+4.0) 0 16.6 17.1 54.2 (-6.8) 16
October 105.1 (-7.0) 16.5 (+2.7) 9.9 (+3.3) 0 12.7 14.5 105.0 (+30.3) 24
November 113.0 (+42.9) 11.5 (+2.1) 4.3 (+1.0) 12 7.2 9.9 104.4 (+38.2) 22
December 65.6 (+17.5) 8.8 (+1.6) 3.4 (+1.4) 9 5.7 7.5 95.0 (+24.9) 22
                         
Year 1689.9 (+152.2) 14.6 (+1.2) 7.1 (+1.5) 79 11.5 11.5 779.3 (+75.8) 216
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2005
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 81.3 (+26.3) 8.3 (+2.0) 2.5 (+1.6) 20 4.1 5.8 33.8 (-35.9) 22
February 66.3 (-4.4) 6.1 (-0.6) 1.2 (+0.5) 20 3.5 5.2 36.2 (-12.9) 23
March 99.3 (-7.9) 10.0 (+0.5) 3.2 (+0.9) 14 5.2 5.9 43.2 (-10.7) 17
April 149.5 (+2.7) 13.1 (+1.1) 4.7 (+1.1) 5 8.4 9.4 65.6 (+12.1) 21
May 214.4 (+19.5) 15.8 (+0.0) 6.9 (+0.6) 8 11.8 12.1 44.4 (-5.3) 19
June 219.4 (+29.1) 20.6 (+2.0) 10.7 (+1.5) 3 16.2 15.5 44.0 (-16.2) 11
July 176.5 (-26.8) 20.9 (-0.5) 12.6 (+1.2) 0 16.9 17.0 39.0 (-3.1) 14
August 205.3 (+8.5) 21.3 (-0.1) 11.0 (-0.4) 0 15.5 16.4 58.6 (+4.9) 12
September 149.4 (+7.1) 19.7 (+1.7) 10.9 (+1.4) 1 14.39 16.2 65.0 (+4.0) 19
October 94.2 (-17.9) 16.4 (+2.6) 10.1 (+3.5) 0 12.2 13.6 88.4 (+13.7) 19
November 96.1 (+26.0) 9.3 (-0.0) 2.3 (-1.0) 18 6.3 9.3 53.2 (-13.0) 24
December 82.0 (+33.9) 6.8 (-0.4) 1.1 (-0.8) 20 4.1 5.8 51.0 (-19.1) 20
                         
Year 1633.7 (+96.0) 14.0 (+0.7) 6.4 (+0.8) 109 9.9 11.0 622.4 (-71.1) 221
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2004
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 56.5 (+1.5) 7.5 (+1.2) 1.8 (+1.0) 14 3.7 5.1 90.0 (+20.3) 23
February 77.7 (+7.0) 7.5 (+0.8) 2.7 (+2.0) 13 4.1 5.7 27.0 (-21.8) 14
March 103.2 (-4.0) 9.6 (+0.1) 2.8 (+0.4) 14 4.7 5.6 47.4 (-6.5) 19
April 152.9 (+6.1) 13.5 (+1.5) 4.7 (+1.1) 5 8.5 9.2 82.2 (+28.7) 18
May 187.1 (-7.8) 16.3 (+0.5) 7.7 (+1.4) 0 12.7 12.8 51.6 (+1.9) 12
June 203.2 (+12.9) 20.3 (+1.7) 10.5 (+1.3) 0 16.0 15.7 32.4 (-27.8) 12
July 175.2 (-28.1) 21.4 (-0.1) 11.3 (-0.1) 0 16.1 16.1 49.8 (+7.7) 19
August 165.0 (-31.8) 22.4 (+0.9) 13.8 (+2.5) 0 17.5 18.0 113.4 (+59.7) 24
September 166.9 (+24.6) 19.4 (+1.4) 11.1 (+1.6) 0 14.4 15.6 24.4 (-36.6) 17
October 85.6 (-26.5) 13.8 (+0.1) 7.5 (+0.8) 0 10.1 12.2 126.4 (+51.7) 26
November 70.3 (+0.2) 9.8 (+0.4) 4.9 (+1.6) 8 7.6 9.5 73.6 (+7.4) 21
December 61.0 (+12.9) 7.7 (+0.5) 1.9 (+0.0) 17 4.7 6.5 40.4 (-29.7) 16
                         
Year 1504.6 (-33.1) 14.1 (+0.8) 6.7 (+1.1) 71 11.0 10.9 758.6 (+55.0) 221
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2003
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 67.8 (+12.8) 6.5 (+0.2) 1.3 (+0.4) >14 3.4 5.2 96.0 (+26.3) 21
February 94.2 (+23.5) 6.9 (+0.2) 0.4 (-0.3) 20 2.5 4.1 25.6 (-23.2) 11
March 168.0 (+60.8) 12.1 (+2.6) 2.5 (+0.1) 6 5.6 6.7 23.5 (-30.4) 8
April 186.4 (+39.6) 14.2 (+2.2) 4.2 (+0.6) 13 8.9 8.9 37.7 (-15.8) 8
May 196.0 (+1.1) 16.9 (+1.2) 7.4 (+1.1) 2 12.8 12.4 43.2 (-6.5) 14
June 220.6 (+30.3) 21.4 (+2.8) 11.2 (+2.0) 0 18.3 16.4 45.1 (-15.1) 12
July 204.5 (+1.2) 22.9 (+1.5) 12.9 (+1.5) 0 19.4 17.7 39.6 (-2.5) 14
August 247.4 (+50.6) 25.0 (+3.5) 13.4 (+2.1) 0 20.5 18.6 2.3 (-51.4) 3
September 188.5 (+46.2) 20.5 (+2.5) 8.5 (-0.9) 3 14..7 15.6 15.1 (-45.9) 5
October 145.8 (+33.7) 13.3 (-0.5) 5.1 (-1.6) 13 8.6 11.4 37.9 (-36.8) 13
November 80.3 (+10.2) 11.2 (+1.8) 5.4 (+2.0) 7 7.5 9.4 137.4 (+71.2) 19
December 63.4 (+15.3) 7.4 (+0.2) 1.9 (-0.1) 17 3.9 6.2 90.6 (+20.5) 24
                         
Year 1862.9 (+325.2) 14.8 (+1.5) 6.2 (+0.6) 95 11.3 11.2 594 (-109.5) 152
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2002
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 37.8 (-17.3) 8.4 (+2.0) 2.4 (+1.5) 11 3.9 4.9 69.4 (-0.3) 21
February 80.1 (+9.4) 10.1 (+3.4)

3.4

(+2.7) 8 5.3 6.8 84.0 (+35.2) 21
March 98.4 (-8.8) 11.3 (+1.8) 3.4 (+1.1) 13 6.0 7.3 49.3 (-4.6) 10
April 200.9 (+54.1) 14.2 (+2.2) 4.5 (+0.9) 7 9.2 9.6 55.7 (+2.2) 8
May 173.5 (-21.4) 15.7 (-0.0) 7.8 (+1.5) 1 12.0 12.3 81.0 (+31.3) 16
June 189.8 (-0.5) 19.0 (+0.4) 9.9 (+0.7) 0 16.2 15.3 29.2 (-31.0) 15
July 179.5 (-23.8) 20.9 (-0.5) 11.8 (+0.5) 0 17.8 17.1 93.5 (+51.4) 14
August 155.7 (-41.1) 21.6 (+0.2) 13.2 (+1.9) 0 18.0 18.4 52.3 (-1.4) 10
September 163.7 (+21.4) 18.6 (+0.6) 10.0 (+0.6) 0 14.6 15.9 25.6 (-35.4) 5
October 95.4 (-16.7) 13.6 (-0.1) 6.6 (-0.1) 7 9.9 12.2 89.3 (+14.6) 15
November 48.6 (-21.5) 11.2 (+1.8) 5.6 (+2.3) 4 7.6 9.7 132.9 (+66.7) 24
December 30.9 (-17.2) 7.5 (+0.3) 4.1 (+2.2) 6 5.6 7.1 112.6 (+42.5) 25
                         
Year 1454.3 (-83.4) 14.3 (+1.0) 6.9 (+1.3) 57 11.4 11.4 874.8 (+171.3) 184
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page

Rothamsted Research (Harpenden)
The weather : Monthly Summary : 2001
(Departure from the 30 year means (1971 - 2000) in brackets)
 
 
  Sunshine Mean Temperatures Rainfall
    Maximum Minimum Ground Frost * 10cm Under Bare Soil 30cm Under Grass Total Duration
  Hours ( ) oC ( ) oC ( ) no. oC oC mm ( ) days**
January 84.2 (+29.2) 5.7 (-0.7) 0.4 (-0.5) 27 2.1 3.7 76.1 (+6.4) 16
February 89.0 (+18.3) 7.8 (+1.1) 1.5 (+0.8) 18 3.7 4.8 110.4 (+61.6) 16
March 68.4 (-38.8) 8.2 (-1.3) 2.6 (+0.2) 10 4.7 5.5 91.4 (+37.5) 22
April 133.2 (-13.6) 11.4 (-0.6) 4.1 (+0.5) 11 7.4 8.4 83.7 (+30.2) 23
May 223.2 (+28.3) 17.4 (+1.6) 7.8 (+1.5) 2 12.9 12.5 50.1 (+0.4) 7
June 230.4 (+40.1) 18.8 (+0.2) 9.7 (+0.5) 0 16.9 15.4 27.9 (-32.3) 9
July 199.8 (-3.5) 22.0 (+0.6) 13.0 (+1.6) 0 18.9 17.5 56.1 (+14.0) 10
August 199.2 (+2.4) 21.7 (+0.2) 12.9 (+1.5) 0 17.9 17.9 119.2 (+65.5) 17
September 127.6 (-14.7) 16.5 (-1.4) 10.0 (+0.6) 0 13.3 15.2 73.8 (+12.8) 16
October 100.7 (-11.4) 16.3 (+2.6) 10.6 (+3.9) 0 12.2 13.9 115.7 (+41.0) 20
November 80.7 (+10.6) 10.1 (+0.7) 3.7 (-0.3) 9 6.4 9.3 49.0 (-17.2) 17
December 73.7 (+25.6) 5.9 (-1.3) 0.7 (-1.3) 22 3.1 5.9 19.5 (-50.6) 12
                         
Year 1610.1 (+72.4) 13.5 (+0.1) 6.4 (+0.8) 99 10.8 10.8 872.9 (+169.4) 185
                         
* Number of nights grass minimum below 0.0 oC
** Number of days rain was 0.2 mm or more Top of Page