Epping Weather Station

Monthly Summary: December 2012 (Daily Readings)

Temperature °C
   Date or compared to 1981-2010 average
Mean Maximum
7.4
+0.5
Mean Minimum
1.8
-0.6
Monthly Mean
4.6
0.0
Highest Maximum
12.4
22nd
Lowest Maximum
-0.2
11th
Highest Minimum
6.7
23rd, 24th
Lowest Minimum
-5.9
12th
Grass Minimum
-8.6
12th
Wind mph
Mean wind speed
6.5
Strongest Gust
37
Date
7th
Dominant Direction
SSW
Direction at 0900
N
NE
E
SE
S
SW
W
NW
CALM
No of mornings
4
0
2
2
12
2
7
1
1
Precipitation mm
 Date or compared to 1981-2010 average
Monthly Total
108.9
192.7%
Wettest Day (09-09)
21.8
19th
Rain Days (>0.2mm)
22
Wet Days (>1mm)
17
Sunshine hours
Monthly Total
47.31
% Average
79.5
Days with no sun
8
Sunniest day
6.63hrs
Date
2nd
Number of days with
Air Frost
11
Ground Frost
14
Snow/sleet falling (0000-2400GMT)
2
>50% snow cover at 0900
2
Fog at 0900 (vis <1000m)
2
Thunder heard
1
Hail <5mm diameter
0
Hail > 5mm diameter
0

 
Miscellaneous Data
Mean Relative Humidity at 0900 (%)
94.4
Mean Air Pressure at 0900 (mb)
1007.0
Lowest Pressure
974.9
Date
14th
Highest Pressure
1029.8
Date
11th
Hours of air frost
122.6
Mean soil temp °C (20cm depth)
4.2
Greatest snow depth (0900)
3cm
Date
5th
Particular days/events
5th 3cm snow at 0900Z. Much rush hour disruption locally
11th Ice Day. Fog at 0900Z
14th Fog at 0900Z. Milder air from SW. Rain ahead of front with pressure falling to 974.9mm at passage of front
25th Thunder on Christmas Day

 

Month as a whole

Cold and fairly dry first half, much milder and wetter second half
Wettest December since 2002 and fourth wettest in my record which begins in 1979
Fourth dullest with sunshine recording beginning in 2009

 

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(amended January 2009)

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