January 2005

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

Mean daily maximum: 8.3
Difference from average: +2.5

Mean daily minimum: 2.7
Difference from average: +2.5

Mean air temperature: 5.5
Difference from average: +2.5

Absolute maximum: 13 (10th)

Absolute minimum: -2.2 (22nd)

Mean grass minimum: 1.5

Absolute grass minimum: -6.3 (22nd)

Number of ground frosts: 8

Number of air frosts: 6

Mean soil temperature at 30cm depth: 5.1

Mean soil temperature at 100cm depth: 7.1

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

Total for the month: 34.2
Difference from average: -24.8

Percentage of the average: 58%

Wettest day: 6.6 (8th)

Number of rain days (>0.25mm): 11

Number of wet days (=> 1mm): 9

3-month total rainfall to 31st January: 56.8
Difference from average: -121.5

6-month rainfall total to 31st January: 353.6
Difference from average: 0.2

12-month rainfall total to 31st January: 675.8
Difference from average: 26.9

Humidity
(Averages for 09:00 hours GMT)

Relative Humidity: 81%

Sunshine
(all averages 1961 – 1990)

Total for the month: 56.7 hours
Difference from average: +2.9

Percentage of the average: 105%

Mean daily sunshine: 1.8 hours
Difference from average: +0.1

Sunniest day: 4.6 hours (30th)

Number of days with no recorded sunshine: 5

Wind

The mean wind speed: 20.7km/h [11kt]
Difference from average: +6.0km/hr

The highest gust: 137km/h [56.7kt] from 211° at 06:47 GMT on 8th

ISSN1350-483

Comments on January 2005
January was a mild month with all measures of temperature well above average. Mean air temperature for January was 9th highest since 1850, the warmest since 1989. It was a dry month, with rainfall total well below average, continuing the pattern of the previous two months – the 3-month total is well below average therefore. Perhaps most notable was the wind – it was generally a very windy month, with mean speeds well above average. Extremely high gusts on the morning of the 8th caused havoc on the A1; the maximum gust of 137 km/h (86 mph) is, I believe, the highest recorded since we installed the new anemometer in 1999.

Professor Tim Burt
Department of Geography
Durham University