Dulles Airport, VA

12:01 AM EDT on April 24, 2018 (GMT -0400)
Washington Dulles International

Weather History for KIAD - September, 2012

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Month of September, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 92 °F 80 °F 68 °F
Mean Temperature 82 °F 68 °F 57 °F
Min Temperature 73 °F 56 °F 45 °F
Degree Days  
Heating Degree Days (base 65) 8 2 0 51
Cooling Degree Days (base 65) 17 5 0 151
Growing Degree Days (base 50) 32 18 6 547
Dew Point  
Dew Point 75 °F 57 °F 36 °F
Precipitation  
Precipitation 1.17 in 0.09 in 0.00 in 2.71 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 36 mph 6 mph 0 mph
Gust Wind 47 mph 21 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.39 in 30.04 in 29.60 in

Monthly Weather History Graph

Monthly Weather History Graph

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Astronomy

Sep. 25, 2012 Rise Set
Actual Time 7:00 AM EDT 7:01 PM EDT
Civil Twilight 6:34 AM EDT 7:27 PM EDT
Nautical Twilight 6:03 AM EDT 7:58 PM EDT
Astronomical Twilight 5:31 AM EDT 8:30 PM EDT
Moon 4:23 PM EDT (9/25) 2:22 AM EDT (9/25)
Length of Visible Light 12h 53m
Length of Day
12h 00m
Waxing Gibbous, 80% of the Moon is Illuminated
Sep 25
Waxing Gibbous
Sep 29
Full
Oct 8
Last Quarter
Oct 15
New
Oct 21
First Quarter

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 92 81 70 72 69 66 84 67 49 30.09 30.04 29.99 10 10 10 13 5 18 T Thunderstorm
2 83 77 71 75 72 69 100 83 65 30.05 30.02 29.97 10 9 2 8 3 13 0.39 Rain , Thunderstorm
3 84 79 73 73 71 69 100 81 61 30.06 30.02 29.99 10 9 6 14 5 25 0.00  
4 88 80 71 73 71 69 100 80 59 30.03 29.95 29.86 10 10 7 21 9 29 0.02 Rain
5 91 82 72 72 71 68 93 72 50 29.86 29.83 29.78 10 10 8 15 6 21 0.00  
6 86 78 70 73 71 67 94 75 55 29.94 29.88 29.83 10 10 7 14 5 18 0.03 Rain
7 91 78 65 69 68 64 100 74 47 29.95 29.90 29.83 10 9 4 14 5 20 0.00 Fog
8 91 77 62 70 66 57 93 70 47 29.85 29.74 29.60 10 9 2 36 9 47 0.16 Rain , Thunderstorm
9 79 69 59 57 52 45 84 60 35 29.99 29.89 29.85 10 10 10 18 7 25 0.00  
10 76 64 52 52 48 42 83 57 31 30.18 30.08 29.99 10 10 10 18 8 29 0.00  
11 78 62 46 50 45 40 86 56 25 30.33 30.27 30.19 10 10 10 17 2 24 0.00  
12 81 64 47 54 50 46 93 63 33 30.38 30.33 30.31 10 10 10 12 4 20 0.00  
13 82 66 50 57 51 48 96 65 33 30.39 30.33 30.27 10 10 7 10 3 15 0.00 Fog
14 82 66 50 58 53 46 96 62 28 30.29 30.20 30.11 10 10 10 13 4 18 0.00  
15 78 65 51 61 49 44 84 58 31 30.25 30.17 30.12 10 10 10 20 8 26 0.00  
16 75 63 50 53 49 47 93 67 41 30.19 30.14 30.08 10 10 10 9 3 25 0.00  
17 72 60 47 66 56 47 100 83 66 30.13 30.07 29.97 10 8 4 14 4 16 0.06 Fog , Rain
18 77 70 62 71 67 60 100 94 87 29.94 29.73 29.60 10 7 0 29 12 41 1.17 Rain
19 70 60 49 54 46 40 86 60 33 30.18 30.06 29.87 10 10 10 16 7 36 0.00  
20 75 61 46 54 49 45 93 67 41 30.19 30.13 30.06 10 10 10 12 4 16 0.00  
21 79 65 51 62 57 51 100 76 52 30.09 30.02 29.95 10 10 10 14 5 18 0.00  
22 85 74 63 68 60 50 93 69 44 29.94 29.87 29.78 10 10 7 25 10 33 0.23 Rain
23 68 58 48 46 42 38 80 57 34 30.17 30.11 29.95 10 10 10 25 7 33 0.00  
24 68 57 45 46 42 36 86 59 32 30.25 30.19 30.15 10 10 10 15 5 22 0.00  
25 76 61 45 54 47 43 86 61 36 30.21 30.15 30.07 10 10 10 16 7 22 0.00  
26 83 72 60 64 59 55 90 68 46 30.15 30.10 30.06 10 10 6 16 8 23 0.02 Rain , Thunderstorm
27 84 73 61 66 62 59 100 73 46 30.17 30.12 30.07 10 9 2 18 5 25 0.53 Rain , Thunderstorm
28 77 69 61 66 60 48 100 76 51 30.12 30.04 29.99 10 7 0 14 6 17 0.09 Fog , Rain
29 70 60 50 50 47 43 77 59 40 30.04 29.98 29.93 10 10 10 15 6 21 0.00  
30 73 59 45 52 48 43 93 64 35 29.93 29.88 29.80 10 10 9 28 5 39 0.01 Rain