Climate Data and Brief Summary for December 2004

Last updated 2nd January 2005

*Anomalies are based on averages for the period 1971-2000

SCREEN TEMPERATURES °c
                                        Anomaly*       Date
Mean                        4.6           0.7
Mean Maximum                6.8           0.6
Mean Minimum                2.3           0.8
High Maximum               10.8                        30th
Low Minimum                -4.0                        27th
Low Maximum                 0.6                        26th
High Minimum                8.8                        23rd
Low Grass                  -8.0                        27th
Air Frosts                   8           -2
Ground Frosts               14           -3
Hours of Frost             67.0

Barometric pressure, 24 hour observations (mbar)
Mean                      1015.9          3.6
Maximum                   1029.3                        8th                               
Minimum                    992.4                       25th

PRECIPITATION (mm)
Total                       51.5        -28.8                                           
Rain days (0.2mm or more)   15           -4                                            
Wet days (1.0mm or more)    12           -1 
Maximum Fall                15.3                       22nd
Rainfall duration (hrs.)    37.0
 
SUNSHINE

Sun Hours                   58.1        +20.0
Maximum day                  6.9                       26th
Nil Sun Days                 7

HUMIDITY %

Mean                        92.7
Dry days (60% or less)       0                                                  

WIND (mph)

24hour mean                  4.4
09.00 mean                   4.5
Maximum gust                36.0                       17th 
%North                       3
%North East                  3
%East                        0
%South East                  5
%South                       6
%South West                 26
%West                       29
%North West                 18
%Calm                       10
Hours of calm               90.0

MISCELLANEOUS

Days with:

Sleet/Snow                   4           -1 
Snow lying (09.00)           4            1
Maximum depth (cm)           8.0                       25th   
Total snow depth (cm)        8.6
Hail                         3
Thunder                      1
Fog (09.00)                  2

Brief summary of the month:
December 2004 was a changeable month with mild damp weather mixed in with
a few colder, wintry spells. The overall mean temperature was above average 
making it the warmest since 1994. The month was fairly dry with only 64% 
of the average rainfall. Sunshine totals were well above normal with 152%
of the average. 

All data taken at 220 metres above sea level


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