November 2017

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

Mean daily maximum: 9.0
Difference from average: +0.3

Mean daily minimum: 3.1
Difference from average: +0.4

Mean air temperature: 6.0
Difference from average: +0.3

Absolute maximum: 14.1 (22nd)

Absolute minimum: -1.0 (6th & 30th)

Mean grass minimum: 0.5

Absolute grass minimum: -3.7 (30th)

Mean concrete minimum: 2.9

Absolute concrete minimum: -1.0 (30th)

Number of ground frosts: 17

Number of air frosts: 4

Mean soil temperature at 30cm depth: 8.5

Mean soil temperature at 100cm depth: 10.5

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

Total for the month: 76.0
Difference from average: +14.0

Percentage of the average: 123%

Wettest day: 39.2 (22nd)

Number of rain days (>0.25mm): 12

Number of wet days (=> 1mm): 7

3-month total rainfall to 30th November: 194.0
Difference from average: +22.0

6-month rainfall total to 30th November: 418.6
Difference from average: +72.4

12-month rainfall total to 30th November: 670.1
Difference from average: +21.7

(averages for 09:00 hours GMT)

Relative Humidity: 81%

(all averages 1961 – 1990)

Total for the month: 90.3 hours
Difference from average: +24.2

Percentage of the average: 136%

Mean daily sunshine: 3 hours
Difference from average: +0.8

Sunniest day: 6.6 hours (12th)

Number of days with no recorded sunshine: 2

Cumulative total sunshine since 1st January: 1154.4 hours
Difference from average: -129.2


Comments on November 2017
November was warmer than average, but not exceptionally so. All three ‘mean’ measures were above average. Even so, the number of ground frosts (17) was also above average. It would have been a dry month too, except for the exceptional downpour on 22nd when a total of 38.2mm was recorded, the equal 58th wettest day on record at Durham since 1850. If we use the ‘meteorological day’ (starting 09:00), then the total was 39.2mm, equal to the total on 28th July 2013, the 50th equal wettest day on record and thereby the equal wettest day since 16th April 2005. There were some exceptional hourly intensities: 9.4mm in the hour ending 20:00 GMT; 9.2mm in the hour ending 22:00 GMT and 7.2mm in the hour ending 23:00 GMT. The number of rain days (12) was well below average (18). It was a sunny month, the sunniest November since 2013 and the 7th sunniest November at Durham since 1882.

Emeritus Professor Tim Burt
Department of Geography
Durham University