June 2013

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

Mean daily maximum: 18.1
Difference from average: +0.6

Mean daily minimum: 8.6
Difference from average: 0.0

Mean air temperature: 13.4
Difference from average: +0.4

Absolute maximum: 23.7 (6th)

Absolute minimum: 4.7 (3rd)

Mean grass minimum: 6.2

Absolute grass minimum: 1.3 (1st)

Number of ground frosts: 0

Number of air frosts: 0

Mean soil temperature at 30cm depth: 14.2

Mean soil temperature at 100cm depth: 12.1

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

Total for the month: 38.4
Difference from average: -13.5

Percentage of the average: 74%

Wettest day: 15.8 (6th)

Number of rain days (>0.25mm): 9

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

3-month total rainfall to 30th June: 162.0
Difference from average: +10.9

6-month rainfall total to 30th June: 336.6
Difference from average: +33.8

12-month rainfall total to 30th June: 968.0
Difference from average: +319

Humidity
(Averages for 09:00 hours GMT)

Relative Humidity: 75%

Sunshine
(all averages 1961 – 1990)

*Total for the month: 144.9 hours
Difference from average: -18.8

Percentage of the average: 89%

Mean daily sunshine: 4.8 hours
Difference from average: -0.7

Sunniest day: 11.4 hours (4th)

Number of days with no recorded sunshine: 0

Cumulative total sunshine since 1st January: 619 hours
Difference from average: -71.1

*Estimate: Seven days with no recorded sunshine.

ISSN1350-483

Comments on June 2013
Temperatures in June were above average, but not exceptionally so. The mean maximum was above normal whereas the mean minimum equalled the average. Only four days had maxima above 20°C. It was a dry month: the 3-month and 6-month cumulative totals are both now close to average. The 12-month total is still well above average, but below 1000mm for the first time since the end of November 2012.

Note that there were some problems with the data logger during June: seven days lacked a full dataset include no sunshine data at all.

Professor Tim Burt
Department of Geography
Durham University