Royston (Iceni) Weather Station

30 Year (1981/2010)Temperature and Rainfall Extremes

1. Temperature

Event     °C    

Date/Month/
           

Year
             
Highest Temperature     36.4     10/08/2003
Lowest Temperature     -12.7     14/01/1982
Lowest Grass Minimum Temperature     -18.1     10/01/1982
Coldest Day - Maximum Temperature     -7.3     12/01/1987
Warmest Year - Mean Temperature     11.7    

2006
Coldest Year - Mean Temperature    

9.4

    

1986
Hottest Month - Mean Daily Maximum Temperature     26.1     August 1997
Hottest Month - Mean Daily Minimum Temperature     15.6     August 1997
Coldest Month - Mean Daily Maximum Temperature     0.8     February 1986
Coldest Month - Mean Daily Minimum Temperature     -4.0     February 1986
Mildest Winter - Mean Temperature    

6.9

    

2006/07
Coldest Winter - Mean Temperature    

1.7

    

1981/82, 1984/85, 1995/96
Warmest Spring - Mean Temperature    

11.1

    

2007
Coldest Spring - Mean Temperature    

7.6

    

1984
Hottest Summer - Mean Temperature    

18.7

    

2003

Coolest Summer - Mean Temperature    

15.4

    

1985
Mildest Autumn - Mean Temperature    

13.7

    

2006
Coldest Autumn - Mean Temperature    

8.9

    

1993
Hottest Day of Year on average - Mean Maximum Temperature     24.4     29th July
Coldest Day of Year on average - Mean Maximum Temperature     6.0     7th January
Warmest Night of Year on average - Mean Minimum Temperature     14.2     29th July
Coldest Night of Year on average - Mean Minimum Temperature     0.4     14th February
     

No.

      
Annual Highest No. of Air Frosts    

66

    

2010
Annual Highest No. of Ground Frosts    

116

    

2010
Annual Lowest No. of Air Frosts    

12

    

1990
Annual Lowest No. of Ground Frosts    

47

    

2002
             
2. Rainfall            
             
Event     MM     Date/Month/
            Year
             
Wettest Year    

821.0

    

2000
Driest Year    

403.1

    

1996
Wettest Month     149.3    

August 2010
Driest Month    

0.7

    

August 2003
Wettest Winter    

255.1

    

1989/90
Driest Winter    

69.6

    

1991/92
Wettest Spring    

252.6

    

1983
Driest Spring    

40.4

    

1996
Wettest Summer    

234.1

    

1987
Driest Summer    

45.8

    

1995
Wettest Autumn    

334.1

    

2000
Driest Autumn    

70.2

    

1985
Wettest Day    

78.1

    

22/09/92
Wettest Day of Year on average - Mean Rainfall    

6.1

    

20th October
Driest Day of Year on average - Mean Rainfall    

0.3

    

25th July
      No.      
Annual Highest No. of "Rain Days" (0.2 mm or more)    

193

    

2000
Annual Lowest No. of "Rain Days" (0.2 mm or more)    

131

    

1990
Annual Highest No. of Days with Snow Falling    

39

    

2010
Annual Lowest No. of Days with Snow Falling    

1

    

2002
Annual Highest No. of Days with Snow Lying (> 50% cover @ 09GMT)    

36

    

1985
Annual Lowest No. of Days with Snow Lying (> 50% cover @ 09 GMT)    

0

    

 1992, 2002
Annual Highest No. of Days with Thunder    

24

    

1982
Annual Lowest No. of Days with Thunder    

2

    

1986
Annual Highest No. of Days with Hail    

14

    

1983
Annual Lowest No. of Days with Hail    

0

    

1993

The photograph below illustrates one of the interesting cloud effects which occurred in the morning of 7th November 1999. It was taken at 0840 GMT looking ESE from Burloes, Royston. The cloud shown has a striking similarity to foam sometimes seen on a river downstream from a waterfall, or occasionally on the sea close to shore. Another effect seen (not shown) consisted of shadows from aircraft vapour trails on similar cloud which stood out as dark lines across the sky. A ridge of high pressure extending from an anticyclone centred over the Bay of Biscay had moved across the region at the time and gave a mainly sunny morning, but the afternoon was cloudy due to a weak warm front advancing from the west.

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(This page last updated 18th June 2011 2046 GMT)