Weather History for London / Heathrow Airport, United Kingdom

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Month of September, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 82 °F 67 °F 53 °F
Mean Temperature 67 °F 59 °F 50 °F
Min Temperature 61 °F 51 °F 43 °F
Degree Days  
Heating Degree Days (base 65) 15 6 0 198
Cooling Degree Days (base 65) 2 0 0 6
Growing Degree Days (base 50) 17 9 0 273
Dew Point  
Dew Point 61 °F 48 °F 36 °F
Precipitation  
Precipitation 0.51 in 0.03 in 0.00 in 1.02 in
Snowdepth - - - -
Wind  
Wind 21 mph 9 mph 1 mph
Gust Wind - - -
Sea Level Pressure  
Sea Level Pressure 30.42 in 29.98 in 29.10 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 10, 2012 Rise Set
Actual Time 6:29 AM BST 7:27 PM BST
Civil Twilight 5:55 AM BST 8:00 PM BST
Nautical Twilight 5:14 AM BST 8:41 PM BST
Astronomical Twilight 4:30 AM BST 9:25 PM BST
Moon 12:05 AM BST (9/10) 4:14 PM BST (9/10)
Length of Visible Light 14h 05m
Length of Day
12h 57m
Waning Crescent, 32% of the Moon is Illuminated
Sep 10
Waning Crescent
Sep 16
New
Sep 22
First Quarter
Sep 30
Full
Oct 8
Last Quarter

Weather History Calendar

 
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
73 | 55 0.00
Average:
- | - -
Rain
Actual:
65 | 54 0.00
Average:
- | - -
Clear
Actual:
76 | 57 0.00
Average:
- | - -
Clear
Actual:
77 | 56 0.00
Average:
- | - -
Clear
Actual:
69 | 52 0.00
Average:
- | - -
Clear
Actual:
71 | 46 0.00
Average:
- | - -
Clear
Actual:
79 | 51 0.00
Average:
- | - -
Clear
Actual:
81 | 53 0.00
Average:
- | - -
Clear
Actual:
82 | 49 0.00
Average:
- | - -
Rain
Actual:
70 | 61 0.00
Average:
- | - -
Rain
Actual:
66 | 54 0.00
Average:
- | - -
Rain
Actual:
66 | 44 0.08
Average:
- | - -
Clear
Actual:
66 | 44 0.00
Average:
- | - -
Clear
Actual:
69 | 57 0.00
Average:
- | - -
Clear
Actual:
73 | 46 0.00
Average:
- | - -
Clear
Actual:
66 | 55 0.00
Average:
- | - -
Rain
Actual:
67 | 55 0.00
Average:
- | - -
Rain
Actual:
64 | 52 0.00
Average:
- | - -
Clear
Actual:
64 | 43 0.00
Average:
- | - -
Clear
Actual:
64 | 47 0.00
Average:
- | - -
Rain
Actual:
62 | 50 0.01
Average:
- | - -
Rain
Actual:
62 | 43 0.00
Average:
- | - -
Rain
Actual:
53 | 47 0.51
Average:
- | - -
Rain
Actual:
60 | 51 0.31
Average:
- | - -
Rain
Actual:
62 | 49 0.00
Average:
- | - -
Rain
Actual:
60 | 49 0.08
Average:
- | - -
Rain
Actual:
63 | 51 0.02
Average:
- | - -
Rain
Actual:
64 | 47 0.01
Average:
- | - -
Clear
Actual:
62 | 47 0.00
Average:
- | - -
Clear
Actual:
64 | 43 0.00
Average:
- | - -
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2012 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Sep high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 73 64 55 56 51 47 74 60 35 30.37 30.31 30.25 17.0 10.0 4.0 15 6 - 0.00 Rain
2 65 60 54 61 57 52 90 82 70 30.30 30.26 30.24 17.0 10.4 2.0 12 9 - 0.00 Rain
3 76 66 57 60 55 49 91 61 30 30.32 30.29 30.26 16.0 11.1 5.0 6 4 - 0.00  
4 77 66 56 61 57 54 89 69 51 30.26 30.23 30.20 14.0 9.6 4.0 9 5 - 0.00  
5 69 60 52 48 45 44 78 50 31 30.40 30.33 30.29 12.0 10.4 8.0 12 7 - 0.00  
6 71 58 46 53 46 42 87 56 29 30.42 30.37 30.28 11.0 8.2 7.0 10 4 - 0.00  
7 79 65 51 52 49 44 88 54 19 30.30 30.26 30.21 17.0 9.9 4.0 12 8 - 0.00  
8 81 67 53 51 47 36 76 45 12 30.23 30.14 30.04 19.0 11.4 8.0 10 4 - 0.00  
9 82 66 49 57 50 46 84 58 18 30.01 29.88 29.80 16.0 9.1 6.0 17 6 - 0.00  
10 70 66 61 60 57 55 86 70 59 29.84 29.83 29.81 19.0 13.9 8.0 20 14 - 0.00 Rain
11 66 62 54 55 45 38 74 51 32 30.02 29.90 29.80 19.0 17.0 12.0 15 13 - 0.00 Rain
12 66 55 44 52 46 41 79 62 44 30.02 29.97 29.89 19.0 16.0 12.0 14 9 - 0.08 Rain
13 66 55 44 50 45 42 85 61 36 30.15 30.09 30.02 19.0 15.2 11.0 14 8 - 0.00  
14 69 63 57 55 50 44 73 57 34 30.03 29.94 29.88 19.0 18.4 16.0 21 16 - 0.00  
15 73 60 46 51 48 45 81 60 37 30.09 30.04 29.99 14.0 11.9 10.0 14 8 - 0.00  
16 66 60 55 54 51 49 87 66 47 30.00 29.93 29.87 19.0 12.0 9.0 16 10 - 0.00  
17 67 61 55 54 49 43 90 60 32 29.94 29.90 29.88 19.0 13.9 10.0 14 10 - 0.00 Rain
18 64 58 52 50 43 36 78 54 30 30.09 29.94 29.85 16.0 13.2 11.0 14 11 - 0.00 Rain
19 64 54 43 42 40 38 80 57 31 30.23 30.18 30.12 19.0 15.7 13.0 13 8 - 0.00  
20 64 56 47 47 45 42 76 59 39 30.22 30.15 30.10 19.0 15.6 14.0 13 7 - 0.00  
21 62 56 50 53 47 46 87 70 44 30.08 29.99 29.93 16.0 12.1 9.0 8 6 - 0.01 Rain
22 62 52 43 47 41 37 88 58 31 30.16 30.11 30.03 19.0 15.8 12.0 8 7 - 0.00 Rain
23 53 50 47 52 46 41 93 78 61 30.09 29.81 29.42 14.0 8.1 3.0 15 7 - 0.51 Rain
24 60 56 51 58 52 47 96 83 57 29.38 29.22 29.10 19.0 8.1 2.0 21 11 - 0.31 Rain
25 62 56 49 50 47 45 78 67 47 29.21 29.19 29.18 19.0 17.5 14.0 20 13 - 0.00 Rain
26 60 54 49 51 49 47 88 81 67 29.47 29.29 29.20 19.0 16.0 11.0 10 9 - 0.08 Rain
27 63 57 51 51 49 45 92 75 43 29.91 29.73 29.52 19.0 13.3 7.0 12 6 - 0.02 Rain
28 64 54 47 52 49 45 84 76 57 29.93 29.91 29.89 19.0 13.9 6.0 15 9 - 0.01 Rain
29 62 54 47 47 43 40 89 63 32 30.17 30.06 29.95 17.0 13.7 8.0 14 8 - 0.00  
30 64 54 43 52 47 41 84 71 55 30.18 30.09 30.00 16.0 12.1 9.0 20 10 - 0.00