Epping Weather Station

Monthly Summary: December 2009 (Daily Readings)

Temperature °C
   Date or compared to 1971-2000 average
Mean Maximum
5.5
-1.6
Mean Minimum
1.0
-1.7
Monthly Mean
3.3
-1.6
Highest Maximum
12.0
5th
Lowest Maximum
-0.2
18th
Highest Minimum
7.7
6th
Lowest Minimum
-4.4
19th
Lowest Grass Min
-6.4
23rd
Wind mph
Mean wind speed
5.8
Strongest Gust
40
Date
17th
Dominant Direction
SW
Direction at 0900
N
NE
E
SE
S
SW
W
NW
CALM
No of mornings
6
4
3
3
7
2
5
0
1
Precipitation mm
 Date or compared to 1971-2000 average
Monthly Total
73.5
127.6%
Wettest Day (09-09)
13.7
29th
Rain Days (>0.2mm)
23
Wet Days (>1mm)
15
Sunshine hours
Monthly Total
77.53
% Average
172.3
Days with no sun
8
Sunniest days
6.77
Date
20th
Number of days with
Air Frost
14
Ground Frost
18
Snow/sleet falling (0000-2400GMT)
8
>50% snow cover at 0900
7
Fog at 0900 (vis <1000m)
2
Thunder heard
0
Hail <5mm diameter
1
Hail > 5mm diameter
0

 
Miscellaneous Data
Mean Relative Humidity at 0900 (%)
91.1*
Mean Air Pressure at 0900 (mb)
1006.1
Lowest Pressure 982.9
Date
22nd
Highest Pressure 1033.2
Date
11th
Hours of air frost
113.7
Mean soil temp °C (20cm depth)
4.0
Greatest snow depth (0900)
6
Date
22nd

*Recalibration necessary 31/12/2009
Particular days/events

11th Fog at 0900
17th Heavy squally snow showers in evening with blowing snow
18th Ice Day (max temp <0.01º), the third of the year
21st Moderate snow pm, depth 6cm
16th-24th Snow fell every day
18th-24th Snow cover >50% at 0900
25th Patches of snow persist in shade
29th 13.7mm rain, the wettest December day since 2002

 

Month as a whole

Coldest December since 1996 and 4th coldest on record since 1979
Most air frosts since 1995 and 3rd highest total since 1979
Snowiest December, with much ice, since 1981 although December 1981 was in a league of it's own

 

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The data on this website may be freely used for personal and/or academic purposes only - please acknowledge source in publication
(amended January 2009)

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