Epping Weather Station

Monthly Summary: December 2011 (Daily Readings)

Temperature °C
   Date or compared to 1981-2010 average
Mean Maximum
8.4
+1.5º
Mean Minimum
3.2
+0.8º
Monthly Mean
5.8
+1.1º
Highest Maximum
12.3
8th
Lowest Maximum
3.0
18th
Highest Minimum
9.3
26th
Lowest Minimum
-2.2
19th
Grass Minimum
-6.2
19th
Wind mph
Mean wind speed
7.6
Strongest Gust
44
Date
7th
Dominant Direction
SW
Direction at 0900
N
NE
E
SE
S
SW
W
NW
CALM
No of mornings 0 0 0 0 3 14 13 1
0
Precipitation mm
 Date or compared to 1981-2010 average
Monthly Total
62.9
111.3%
Wettest Day (09-09)
15.0
12th
Rain Days (>0.2mm)
19
Wet Days (>1mm)
13
Sunshine hours
Monthly Total
60.92
% Average
102.4
Days with no sun
7
Sunniest days
6.06hrs
Date
22nd
Number of days with
Air Frost
5
Ground Frost
12
Snow/sleet falling (0000-2400GMT)
3
>50% snow cover at 0900
1
Fog at 0900 (vis <1000m)
1
Thunder heard
0
Hail <5mm diameter
1
Hail > 5mm diameter
1

 
Miscellaneous Data
Mean Relative Humidity at 0900 (%) 87.4
Mean Air Pressure at 0900 (mb) 1011.1
Lowest Pressure 979.1mb
Date
 16th
Highest Pressure 1034.3mb
Date
 27th
Hours of air frost
26.7
Mean soil temp °C (20cm depth)
5.6
Greatest snow depth (0900)
1.0
Date
16th
Particular days/events
12th 15.0mm rain
16th 1.0cm snow at 0900
21st Fog at 0900

 

Month as a whole

6th warmest December on record (Recording began here in 1979)
The first December with a mean temperature warmer than the long term mean since 2007

 

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(amended January 2009)

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