Epping Weather Station

Monthly Summary: September 2012 (Daily Readings)

Temperature °C
   Date or compared to 1981-2010 average
Mean Maximum
18.6
+0.2
Mean Minimum
9.8
-0.8
Monthly Mean
14.2
-0.3
Highest Maximum
27.6
9th
Lowest Maximum
13.7
23rd
Highest Minimum
15.9
10th
Lowest Minimum
4.5
22nd
Lowest Grass Min
3.2
22nd
Wind mph
Mean wind speed
4.7
Strongest Gust
29
Date
24th
Dominant Direction
SW
Direction at 0900
N
NE
E
SE
S
SW
W
NW
CALM
No of mornings
5
0
2
1
5
6
11
0
0
Precipitation mm
 Date or compared to 1981-2010 average
Monthly Total
51.3
84.1%
Wettest Day
21.6
23rd
Rain Days (>0.2mm)
10
Wet Days (>1mm)
7
Sunshine hours
Monthly Total
204.59
% Average
121.2
Days with no sun
1
Sunniest day
13.01
Date
6th
Number of days with
Air Frost
0
Ground Frost
0
Snow/sleet falling (0000-2400GMT)
0
>50% snow cover at 0900
0
Fog at 0900 (vis <1000m)
0
Thunder heard
0
Hail <5mm diameter
0
Hail > 5mm diameter
0

 
Miscellaneous Data
Mean Relative Humidity at 0900 (%)
82.6
Mean Air Pressure at 0900 (mb)
1014.8
Lowest Pressure 984.5mb
Date
24th
Highest Pressure 1029.3mb
Date
6th
Hours of air frost
0
Mean soil temp °C (20cm depth)
13.4
Greatest snow depth (0900)
n/a
Date
-
Particular days/events
3rd-10th Very warm
5th-8th Unbroken sunshine.
22nd 0830GMT to 24th 1050GMT pressure fell from 1020.2mb to 984.5mb. Sharp pressure falls at 1430GMT and 2130GMT on 23rd. 29.1mm rain over this period

 

Month as a whole
Sunniest September since 2003 and sunniest month of 2012. Sunniest month since June 2011.
Lowest mean minimum temperature since 1994.
Warm and dry first half of month then much cooler and wetter. 5.1mm rain 1st-22nd, 45.4mm 23rd-30th

 

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(amended January 2009)

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