January 2004
January 2004
Temperatures
(all temperatures in degrees Celsius; all averages 1961 – 1990)
Mean daily maximum: 7.4
Difference from average: +1.4
Mean daily minimum: 2.4
Difference from average: +2.2
Mean air temperature: 4.9
Difference from average: +1.9
Absolute maximum: 12.8 (20th)
Absolute minimum: -5.9 (1st)
Mean grass minimum: 0.7
Absolute grass minimum: -4.4 (26th)
Number of ground frosts: 18
Number of air frosts: 7
Mean soil temperature at 30cm depth: 3.7
Mean soil temperature at 100cm depth: 5.9
Rainfall
(all totals in millimetres; all averages 1961 – 1990)
Total for the month: 84.4
Difference from average: +25.4
Percentage of the average: 143%
Wettest day: 12.4 (16th)
Number of rain days (>0.25mm): 22
Number of wet days (=> 1mm): 18
3-month total rainfall to 31st January: 168.8
Difference from average: -9.7
6-month rainfall total to 31st January: 263.6
Difference from average: -89.8
12-month rainfall total to 31st January: 430.2
Difference from average: -218.8
Humidity
(Averages for 09:00 hours GMT)
Relative Humidity: 85.7%
Sunshine
(all averages 1961 – 1990)
Total for the month: 46 hours
Difference from average: -7.8
Percentage of the average: 85%
Mean daily sunshine: 1.5 hours
Difference from average: -0.2
Sunniest day: 6.4 hours (24th)
Number of days with no recorded sunshine: 10
Wind
The mean wind speed: 14.6km/h [7.9kt]
Difference from average: -0.1km/hr
The highest gust: 83.3km/h [45kt] from 283° at 14:42 GMT on 19th
ISSN1350-483
Comments on January 2004
Despite two short spells of old-fashioned wintry weather, January was as a whole very mild, the 15th warmest on record. Both day – time and night – time temperatures were well above average.
Rainfall was well above average too, by exactly one inch (25.4 mm)! The three-month total is now close to average but the 6 – month total remains well below average, while the 12 – month total remains exceptionally low. The 12 – month total to 31st January 2004 is the 25th lowest in a series of over 1800 values.
Both sunshine and wind speed were a little below average.
Professor Tim Burt
Department of Geography
Durham University