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April 2008

(all temperatures in degrees Celsius; all averages 1961 – 1990)

Mean daily maximum: 11.3
Difference from average: +0.3

Mean daily minimum: 3.3
Difference from average: +0.2

Mean air temperature: 7.3
Difference from average: +0.3

Absolute maximum: 17.6 (3rd)

Absolute minimum: -3.0 (6th)

Mean grass minimum: 0.9

Absolute grass minimum: -6.0 (6th)

Number of ground frosts: 14

Number of air frosts: 4

Mean soil temperature at 30cm depth: 8.2

Mean soil temperature at 100cm depth: 8.0

(all totals in millimetres; all averages 1961 – 1990)

Total for the month: 99.4
Difference from average: +51.9

Percentage of the average: 209%

Wettest day: 15.6 (1st)

Number of rain days (>0.25mm): 18

Number of wet days (=> 1mm): 16

3-month total rainfall to 30th April: 128.6
Difference from average: -11.6

6-month rainfall total to 30th April: 346.6
Difference from average: +27.9

12-month rainfall total to 30th April: 702
Difference from average: +53

(Averages for 09:00 hours GMT)

Relative Humidity: 80%

(all averages 1961 – 1990)

Total for the month: 98.5 hours
Difference from average: -34.7

Percentage of the average: 74%

Mean daily sunshine: 3.3 hours
Difference from average: -1.1

Sunniest day: 8.9 hours (1st)

Number of days with no recorded sunshine: 2

Cumulative total sunshine since 1st January: 386.9 hours
Difference from average: +29.1


The mean wind speed: 14.3km/h [7.7kt]
Difference from average: +0.9km/hr

The highest gust: 68km/h [37kt] from 251° at 00:39 GMT on 1st

[Note: the results given here are not based on “thrown back” values; adjusted values will be issued in due course]


Comments on April 2008
Though disappointing, especially the first half of the month, April was still just above average temperature. It was the coolest April since 2000, with the most ground frosts since 2001. It was also a wet month, the wettest since 2000. Sunshine was well below average, and indeed it was less sunny than March. It was windier than usual with high wind speeds at the beginning of the month continuing the breezy end to March.

Professor Tim Burt
Department of Geography
Durham University