July 2025
SUMMARY OF THE METEOROLOGICAL READINGS AT DURHAM UNIVERSITY OBSERVATORY
July 2025
Temperatures (all temperatures in degrees Celsuis; all averages 1991-2020)
Mean daily maximum: 22.3 Difference from average: +2.1
Mean daily minimum: 12.6 Difference from average: +1.3
Mean air temperature: 17.5 Difference from average: +1.7
Absolute maximum: 27.8 (11th)
Absolute minimum: 8.1 (3rd)
Mean grass minimum: 10.9 Difference from average: +1.4
Absolute grass minimum: 5.5 (3rd)
Mean concrete minimum: 13.0
Absolute concrete minimum: 7.4 (3rd)
Number of ground frosts: 0 Difference from average: 0
Number of air frosts: 0 Difference from average: 0
Mean soil temperature at 300 mm depth: 18.9
Mean soil temperature at 1000 mm depth: 16.5
Rainfall (all totals in millimetres; all averages 1991-2020)
Total for the month: 52.4 Difference from average: -9.6
Percentage of the average: 85%
Wettest day: 13.6 (19th)
Number of rain days (>0.1 mm): 15 Difference from average: 0
Number of wet days (=>1.0 mm): 10
3-month total rainfall to 31st July 2025: 111.6 Difference from average: -56.1
6-month total rainfall to 31st July 2025: 170.0 Difference from average: -135.5
12-month total rainfall to 31st July 2025: 497.4 Difference from average: -183.6
Sunshine (all totals in hours; all averages 1991-2020)
Total for the month: 173.6 Difference from average: -1.6
Percentage of the average: 99 %
Mean daily sunshine: 5.6 Difference from average: -0.1
Sunniest day: 12.3 (13th) Number of days with no recorded sunshine: 0
Note that the monthly sunshine total is now calculated from the UKMO E&NE regional total. Daily sunshine totals quoted here and in the data summary are uncorrected.
Wind (kph; all data from the West Building roof, Lower Mountjoy campus)
Average wind speed: 1.49
Maximum gust: 17.4 (2nd, 15;30, WNW)
Pressure (mbar)
Average: 1013.6
Maximum: 1025.7 (3rd, 10:00 – 10:30) Minimum: 997.6 (21st, 03:30 – 04:00)
Comments on July 2025
Whilst not as exceptional as June, this was still a very warm July, the 6th hottest at Durham since 1844. Both the mean maximum and the mean minimum air temperatures were 8th highest on record.
Rainfall was a little below average. All months this year have had below-average rainfall except January, and all the long-term totals remain well below average. Sunshine was very close to average for the month. It was another calm month.
Emeritus Professor Tim Burt
Department of Geography
Durham University