June 2002

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

Mean daily maximum: 17.6
Difference from average: +0.1

Mean daily minimum: 9.9
Difference from average: +1.3

Mean air temperature: 13.8
Difference from average: +0.7

Absolute maximum: 21.3 (2nd)

Absolute minimum: 5.6 (4th)

Mean grass minimum: 8.3

Absolute grass minimum: 3.2 (4th)

Number of ground frosts: 0

Number of air frosts: 0

Mean soil temperature at 30cm depth: 14.6

Mean soil temperature at 100cm depth: 13.4

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

Total for the month: 42
Difference from average: -9.8

Percentage of the average: 81%

Wettest day: 18 (17th)

Number of rain days (>0.25mm): 10

Number of wet days (=> 1mm): 8

3-month total rainfall to 30 June 2002: 114.4
Difference from average: -37.4

6-month rainfall total to 30 June 2002: 275.8
Difference from average: -27.7

12-month rainfall total to 30 June 2002: 540.8
Difference from average: -108.2

Humidity
(Averages for 09:00 hours GMT)

Relative Humidity: 70%

Sunshine
(all averages 1961 – 1990)

Total for the month: 116.4 hours
Difference from average: -47.3

Percentage of the average: 71%

Mean daily sunshine: 3.9 hours
Difference from average: -1.6

Sunniest day: 10 hours (25th)

Number of days with no recorded sunshine: 2

Cumulative total sunshine since 1st January: 698.9 hours
Difference from average: +8.8

Wind

The mean wind speed: 15.9km/h [8.6 kt]
Difference from average: +4.5km/hr

The highest gust: 63km/h [34 kt] from 212° at 12:22 GMT on 22nd

ISSN1350-483

Comments on June 2002
It did not feel like the 23rd warmest June on record! In fact, maximum temperatures were only about average, and it was warmer than usual nights that made the overall mean air temperature well above average, the warmest June since 1992. An absolute maximum of 21.3°C was, however, particularly disappointing, although one only has to go back to 1997 to find a lower figure! The amount of sunshine was depressing, only 71% of the normal figure. Rainfall was, however, below average, with no rain recorded in the last 13 days. Wind speeds were above average. Altogether, it was a cloudy June with lower than normal daytime temperatures, making it feel like a poor start to the summer, even if mean temperatures were well above average and there was less rain than normal!

Professor Tim Burt
Department of Geography
Durham University