June 2018

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

Mean daily maximum: 19.2
Difference from average: +1.7

Mean daily minimum: 9.5
Difference from average: +0.9

Mean air temperature: 14.3
Difference from average: +1.3

Absolute maximum: 26.6 (25th)

Absolute minimum: 7.1 (10th)

Mean grass minimum: 7.5

Absolute grass minimum: 5.0 (10th)

Mean concrete minimum: 10.5

Absolute concrete minimum: 6.9 (21st)

Number of ground frosts: 0

Number of air frosts: 0

Mean soil temperature at 30cm depth: 16.3

Mean soil temperature at 100cm depth: 13.9

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

Total for the month: 30.8
Difference from average: -21.1

Percentage of the average: 59%

Wettest day: 16.6 (2nd)

Number of rain days (>0.25mm): 8

Number of wet days (=> 1mm): 5

3-month total rainfall to 30th June: 132.2
Difference from average: -39.8

6-month rainfall total to 30th June: 321.0
Difference from average: -25.2

12-month rainfall total to 30th June: 670.2
Difference from average: +21.2

Humidity
(averages for 09:00 hours GMT)

Relative Humidity: 73%

Sunshine
(all averages 1961 – 1990)

Total for the month: 151.8 hours
Difference from average: -11.9

Percentage of the average: 93%

Mean daily sunshine: 5.1 hours
Difference from average: -0.4

Sunniest day: 11.6 hours (26th)

Number of days with no recorded sunshine: 3

Cumulative total sunshine since 1st January: 704.1 hours
Difference from average: +14.0

ISSN1350-483

Comments on June 2018
The mean maximum temperature was the 12th highest for June since 1900 and the highest since 2010. Minimum temperatures were less exceptional. The overall mean air temperature was 9th equal highest for June, just 0.1°C lower than last year. There were 12 days with a maximum above 20°C including the last 7 days of the months, which included 4 days above 25°C. June was a dry month, the 42nd lowest June total since 1850 and the driest June since 2006. The 3- and 6-month running totals are now below average but the 12-month running total remains just a little above average. This was the sunniest June since 2010 but still a little below average.

The weather station came back on line on 6th June so, as last month, the missing data were infilled using a combination of the West Building automatic weather station and Ken Cook’s observations from Copley.

Emeritus Professor Tim Burt
Department of Geography
Durham University