Weather History for Dulles Airport, VA

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Month of September, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 94 °F 79 °F 67 °F
Mean Temperature 83 °F 67 °F 56 °F
Min Temperature 71 °F 54 °F 40 °F
Degree Days  
Heating Degree Days (base 65) 9 2 0 67
Cooling Degree Days (base 65) 18 4 0 133
Growing Degree Days (base 50) 32 17 5 506
Dew Point  
Dew Point 72 °F 54 °F 34 °F
Precipitation  
Precipitation 1.30 in 0.06 in 0.00 in 1.61 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 26 mph 5 mph 0 mph
Gust Wind 37 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.44 in 30.04 in 29.71 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 14, 2013 Rise Set
Actual Time 6:50 AM EDT 7:19 PM EDT
Civil Twilight 6:23 AM EDT 7:46 PM EDT
Nautical Twilight 5:52 AM EDT 8:17 PM EDT
Astronomical Twilight 5:19 AM EDT 8:49 PM EDT
Moon 3:57 PM EDT (9/14) 1:22 AM EDT (9/14)
Length of Visible Light 13h 22m
Length of Day
12h 28m
Waxing Gibbous, 72% of the Moon is Illuminated
Sep 14
Waxing Gibbous
Sep 19
Full
Sep 26
Last Quarter
Oct 4
New
Oct 11
First Quarter

Weather History Calendar

Precipitation Actual month total 1.61 Normal Month Total: 3.92
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Rain
Actual:
92 | 67 0.03
Average:
84 | 62 0.11
Rain
Actual:
91 | 69 0.18
Average:
84 | 61 0.12
Partly Cloudy
Actual:
86 | 67 0.00
Average:
84 | 61 0.12
Scattered Clouds
Actual:
83 | 56 0.00
Average:
84 | 61 0.12
Scattered Clouds
Actual:
85 | 57 0.00
Average:
83 | 61 0.12
Scattered Clouds
Actual:
77 | 55 0.00
Average:
83 | 60 0.11
Partly Cloudy
Actual:
82 | 49 0.00
Average:
83 | 60 0.12
Partly Cloudy
Actual:
90 | 63 0.00
Average:
82 | 60 0.12
Mostly Cloudy
Actual:
80 | 63 0.00
Average:
82 | 59 0.13
Partly Cloudy
Actual:
93 | 70 0.00
Average:
82 | 59 0.12
Partly Cloudy
Actual:
94 | 71 0.00
Average:
81 | 58 0.13
Thunderstorm
Actual:
93 | 69 0.04
Average:
81 | 58 0.13
Rain
Actual:
80 | 57 T
Average:
81 | 58 0.14
Scattered Clouds
Actual:
71 | 47 0.00
Average:
80 | 57 0.14
Partly Cloudy
Actual:
77 | 42 0.00
Average:
80 | 57 0.15
Rain
Actual:
73 | 54 0.06
Average:
79 | 56 0.15
Scattered Clouds
Actual:
70 | 45 0.00
Average:
79 | 56 0.14
Partly Cloudy
Actual:
71 | 40 0.00
Average:
79 | 56 0.15
Scattered Clouds
Actual:
79 | 46 0.00
Average:
78 | 55 0.15
Scattered Clouds
Actual:
80 | 52 0.00
Average:
78 | 55 0.14
Rain
Actual:
74 | 61 1.30
Average:
77 | 54 0.13
Partly Cloudy
Actual:
74 | 55 0.00
Average:
77 | 54 0.13
Partly Cloudy
Actual:
67 | 46 0.00
Average:
77 | 53 0.13
Clear
Actual:
74 | 41 0.00
Average:
76 | 53 0.13
Partly Cloudy
Actual:
77 | 44 0.00
Average:
76 | 52 0.13
Partly Cloudy
Actual:
78 | 51 0.00
Average:
75 | 52 0.13
Partly Cloudy
Actual:
71 | 49 0.00
Average:
75 | 51 0.13
Partly Cloudy
Actual:
69 | 52 0.00
Average:
75 | 51 0.13
Fog
Actual:
74 | 45 0.00
Average:
74 | 50 0.13
Partly Cloudy
Actual:
76 | 45 0.00
Average:
74 | 50 0.14
 

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

2013 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 80 67 71 68 65 93 70 47 29.86 29.81 29.76 10 10 6 26 4 36 0.03 Rain
2 91 80 69 72 69 65 97 71 44 29.84 29.78 29.73 10 9 4 24 4 33 0.18 Rain
3 86 77 67 71 60 52 87 61 34 29.97 29.85 29.73 10 10 10 18 10 25 0.00  
4 83 70 56 59 52 44 84 55 26 30.10 30.05 29.99 10 10 10 13 5 16 0.00  
5 85 71 57 59 55 47 93 65 37 30.14 30.06 30.02 10 10 8 20 7 24 0.00  
6 77 66 55 49 45 39 77 52 27 30.27 30.20 30.14 10 10 10 13 5 20 0.00  
7 82 66 49 62 54 46 87 65 42 30.15 30.06 29.95 10 10 10 13 5 21 0.00  
8 90 77 63 64 61 58 93 67 40 30.05 29.93 29.88 10 10 10 16 6 21 0.00  
9 80 72 63 67 56 46 84 67 49 30.21 30.15 30.07 10 10 10 13 7 16 0.00  
10 93 82 70 72 69 66 97 72 47 30.18 30.14 30.09 10 9 3 14 7 17 0.00  
11 94 83 71 72 70 67 93 69 44 30.15 30.09 30.01 10 9 4 15 5 37 0.00  
12 93 81 69 70 68 65 90 67 44 29.99 29.87 29.76 10 9 6 20 6 24 0.04 Rain , Thunderstorm
13 80 69 57 66 54 45 84 58 31 29.96 29.81 29.72 10 10 10 25 11 31 T Rain
14 71 59 47 48 42 39 86 60 33 30.17 30.07 29.97 10 10 10 16 7 31 0.00  
15 77 60 42 56 48 40 96 67 38 30.25 30.17 30.09 10 10 9 14 5 20 0.00  
16 73 64 54 60 56 51 90 68 46 30.24 30.13 30.05 10 9 2 18 7 23 0.06 Rain
17 70 58 45 51 42 34 77 54 30 30.44 30.36 30.25 10 10 10 14 7 24 0.00  
18 71 56 40 47 42 39 93 65 37 30.35 30.28 30.20 10 10 10 9 3 17 0.00  
19 79 63 46 57 51 45 93 68 43 30.21 30.15 30.09 10 10 10 12 4 16 0.00  
20 80 66 52 59 57 52 100 74 48 30.10 30.04 29.97 10 10 2 16 5 20 0.00  
21 74 68 61 66 61 57 93 79 64 29.96 29.80 29.71 10 7 1 17 8 24 1.30 Rain
22 74 65 55 60 51 45 93 67 40 29.96 29.84 29.75 10 10 6 16 7 22 0.00  
23 67 57 46 47 43 40 93 65 37 30.11 30.06 29.97 10 10 10 15 6 22 0.00  
24 74 58 41 47 44 40 93 64 35 30.13 30.05 29.96 10 10 10 10 2 14 0.00  
25 77 61 44 49 45 38 93 59 24 30.01 29.95 29.90 10 10 10 8 2 12 0.00  
26 78 65 51 51 49 46 89 63 36 30.09 30.00 29.94 10 10 10 13 3 20 0.00  
27 71 60 49 56 53 47 93 73 53 30.25 30.17 30.09 10 10 10 10 1 15 0.00  
28 69 61 52 54 52 49 93 73 52 30.32 30.27 30.23 10 10 10 9 3 16 0.00  
29 74 60 45 54 50 45 100 72 44 30.22 30.15 30.08 10 10 6 9 3 14 0.00 Fog
30 76 61 45 54 50 44 93 67 41 30.11 30.06 29.99 10 10 5 12 2 17 0.00