June 2019

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

Mean daily maximum: 17.0
Difference from average: -0.7

Mean daily minimum: 9.2
Difference from average: +0.6

Mean air temperature: 13.1
Difference from average: -0.2

Absolute maximum: 26.8 (29th)

Absolute minimum: 4.2 (10th)

Mean grass minimum: 7.8

Absolute grass minimum: 2.0 (10th)

Mean concrete minimum: 9.5

Absolute concrete minimum: 5.0 (10th)

Number of ground frosts: 0

Number of air frosts: 0

Mean soil temperature at 30cm depth: 14.7

Mean soil temperature at 100cm depth: 12.8

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

Total for the month: 111.0
Difference from average: +53.9

Percentage of the average: 194%

Wettest day: 23.8 (12th)

Number of rain days (>0.25mm): 16

Number of wet days (=> 1mm): 12

3-month total rainfall to 30th June: 176.6
Difference from average: 4.6

6-month rainfall total to 30th June: 271.6
Difference from average: -74.6

12-month rainfall total to 30th June: 581.0
Difference from average: -68

Sunshine
(all averages 1961 – 1990)

Total for the month: 115.1 hours
Difference from average: -38.5

Percentage of the average: 75%

Mean daily sunshine: 3.8 hours
Difference from average: -1.3

Sunniest day: 11.0 hours (27th)

Number of days with no recorded sunshine: 3

Cumulative total sunshine since 1st January: 699.5 hours
Difference from average: -19.5

Wind
(all data from West Building roof, Lower Mountjoy)

Average wind speed: 6.6kph

Maximum gust: 54.7kph (2nd)

ISSN1350-483

Comments on June 2019
For the second month in a row, mean air temperature was below average (equal 84th lowest since 1850): mean maximum was well below average for June (equal 37th lowest since 1900), but mean minimum was well above average (equal 23rd highest since 1990). The 12-month average has again fallen below 10°C.

This was the wettest month since January 2016 and the wettest June since the very wet summer of 2012. Nevertheless, the 3-month and 6-month totals remain well below average. In line with many places in the country, there were high totals on 12th (23.8mm) and 13th (17.2mm), with the heaviest rain between 22:00 on 12th and 02:00 on 13th when hourly totals of 4.4, 3.8 and 3.6mm were recorded. Not surprisingly, June was a dull month with a sunshine total well below average, less than four hours of bright sunshine per day. It was the 14th dullest June in Durham since 1882, although June 2016 was worse – so too were 2014, 2007 and the dullest June on record 2012.

Emeritus Professor Tim Burt
Department of Geography
Durham University