Weather History for Dulles Airport, VA

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Month of July, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 96 °F 87 °F 75 °F
Mean Temperature 86 °F 79 °F 71 °F
Min Temperature 77 °F 70 °F 58 °F
Degree Days  
Heating Degree Days (base 65) 0 0 0 0
Cooling Degree Days (base 65) 21 14 6 419
Growing Degree Days (base 50) 36 28 20 867
Dew Point  
Dew Point 76 °F 68 °F 50 °F
Precipitation  
Precipitation 3.71 in 0.25 in 0.00 in 7.27 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 23 mph 6 mph 0 mph
Gust Wind 32 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.35 in 30.05 in 29.66 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Jul. 09, 2013 Rise Set
Actual Time 5:52 AM EDT 8:37 PM EDT
Civil Twilight 5:21 AM EDT 9:08 PM EDT
Nautical Twilight 4:41 AM EDT 9:48 PM EDT
Astronomical Twilight 3:56 AM EDT 10:32 PM EDT
Moon 7:13 AM EDT (7/9) 9:14 PM EDT (7/9)
Length of Visible Light 15h 47m
Length of Day
14h 44m
New Moon, 2% of the Moon is Illuminated
Jul 9
New Moon
Jul 15
First Quarter
Jul 22
Full
Jul 29
Last Quarter
Aug 6
New

Weather History Calendar

Precipitation Actual month total 7.27 Normal Month Total: 3.67
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
83 | 71 0.01
Average:
87 | 65 0.13
Rain
Actual:
83 | 73 0.09
Average:
88 | 65 0.12
Rain
Actual:
86 | 71 0.62
Average:
88 | 65 0.12
Partly Cloudy
Actual:
89 | 74 0.00
Average:
88 | 65 0.12
Partly Cloudy
Actual:
88 | 73 0.00
Average:
88 | 65 0.12
Scattered Clouds
Actual:
92 | 73 0.00
Average:
88 | 65 0.12
Rain
Actual:
90 | 70 0.08
Average:
88 | 65 0.11
Rain
Actual:
87 | 70 0.11
Average:
88 | 65 0.12
Rain
Actual:
86 | 70 T
Average:
88 | 66 0.12
Thunderstorm
Actual:
89 | 74 T
Average:
88 | 66 0.11
Thunderstorm
Actual:
87 | 69 3.71
Average:
88 | 66 0.12
Thunderstorm
Actual:
75 | 67 1.14
Average:
88 | 66 0.11
Rain
Actual:
84 | 69 0.01
Average:
88 | 66 0.12
Partly Cloudy
Actual:
89 | 73 0.00
Average:
88 | 66 0.12
Scattered Clouds
Actual:
93 | 70 0.00
Average:
88 | 66 0.12
Scattered Clouds
Actual:
94 | 74 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
94 | 74 0.00
Average:
88 | 66 0.11
Partly Cloudy
Actual:
96 | 73 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
95 | 77 0.00
Average:
88 | 66 0.11
Partly Cloudy
Actual:
92 | 75 0.00
Average:
88 | 66 0.11
Thunderstorm
Actual:
90 | 71 0.13
Average:
88 | 66 0.11
Thunderstorm
Actual:
89 | 71 0.22
Average:
88 | 66 0.12
Partly Cloudy
Actual:
86 | 72 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
84 | 69 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
79 | 62 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
83 | 58 0.00
Average:
88 | 66 0.12
Rain
Actual:
84 | 65 0.92
Average:
88 | 66 0.12
Thunderstorm
Actual:
84 | 66 0.09
Average:
88 | 66 0.12
Scattered Clouds
Actual:
81 | 62 0.00
Average:
88 | 66 0.12
Partly Cloudy
Actual:
82 | 60 0.00
Average:
88 | 66 0.13
Rain
Actual:
79 | 63 0.14
Average:
88 | 66 0.12
 

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
Jul high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 83 77 71 72 69 67 90 76 62 29.98 29.92 29.85 10 10 8 15 7 20 0.01 Rain
2 83 78 73 72 71 70 93 81 69 30.18 30.08 29.99 10 10 6 17 9 23 0.09 Rain
3 86 79 71 76 72 69 93 79 65 30.24 30.21 30.17 10 8 1 15 7 28 0.62 Rain
4 89 82 74 72 71 67 93 72 50 30.26 30.22 30.17 10 9 6 18 9 24 0.00  
5 88 81 73 71 70 68 87 70 53 30.25 30.20 30.13 10 10 10 20 10 28 0.00  
6 92 83 73 72 71 68 93 71 49 30.19 30.14 30.08 10 10 10 16 8 22 0.00  
7 90 80 70 72 70 64 97 76 55 30.11 30.07 30.00 10 10 6 23 6 32 0.08 Rain
8 87 79 70 70 67 64 100 74 48 30.12 30.09 30.05 10 10 7 14 5 17 0.11 Rain
9 86 78 70 73 70 68 93 79 65 30.11 30.07 30.01 10 10 10 13 4 17 T Rain
10 89 82 74 74 72 68 94 77 59 30.01 29.95 29.87 10 8 3 18 7 24 T Rain , Thunderstorm
11 87 78 69 72 68 64 93 70 46 29.96 29.91 29.86 10 7 1 17 7 23 3.71 Rain , Thunderstorm
12 75 71 67 68 66 64 97 88 79 30.05 29.99 29.71 10 6 1 15 8 17 1.14 Rain , Thunderstorm
13 84 77 69 73 68 66 97 80 62 30.27 30.15 30.05 10 8 2 10 3 17 0.01 Rain
14 89 81 73 73 72 68 100 78 55 30.35 30.31 30.27 10 8 2 10 6 14 0.00  
15 93 82 70 72 71 68 93 69 44 30.32 30.27 30.20 10 10 6 10 3 18 0.00  
16 94 84 74 73 70 65 94 69 44 30.25 30.22 30.17 10 10 10 14 5 20 0.00  
17 94 84 74 74 70 66 87 64 41 30.23 30.17 30.10 10 10 10 10 4 16 0.00  
18 96 85 73 76 73 71 93 71 49 30.12 30.08 30.01 10 9 7 9 4 13 0.00  
19 95 86 77 76 74 68 91 70 49 30.01 29.96 29.88 10 8 4 16 6 20 0.00  
20 92 84 75 74 71 68 88 68 47 29.90 29.87 29.80 10 10 7 16 8 20 0.00  
21 90 81 71 73 70 66 94 72 50 29.95 29.92 29.89 10 10 8 15 4 18 0.13 Rain , Thunderstorm
22 89 80 71 73 71 66 93 74 55 29.94 29.86 29.76 10 9 2 22 5 30 0.22 Rain , Thunderstorm
23 86 79 72 72 69 64 93 71 48 29.76 29.72 29.66 10 10 8 21 7 25 0.00  
24 84 77 69 69 62 55 84 63 42 29.92 29.80 29.70 10 10 10 16 8 22 0.00  
25 79 71 62 60 53 50 84 62 39 30.05 29.99 29.92 10 10 10 16 9 24 0.00  
26 83 71 58 60 58 54 90 64 37 30.11 30.06 30.03 10 10 10 10 3 14 0.00  
27 84 75 65 70 66 60 93 78 63 30.05 29.99 29.94 10 9 2 18 5 24 0.92 Rain
28 84 75 66 70 68 63 97 76 55 30.00 29.93 29.90 10 9 7 21 4 26 0.09 Rain , Thunderstorm
29 81 72 62 65 57 52 100 70 39 30.17 30.09 30.01 10 10 7 13 6 17 0.00  
30 82 71 60 61 58 55 93 68 42 30.24 30.19 30.15 10 10 10 10 2 15 0.00  
31 79 71 63 68 65 61 93 80 67 30.16 30.09 30.02 10 8 2 15 4 23 0.14 Rain