Weather History for Dulles Airport, VA

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Sunday, August 18, 2013

  Actual Average Record
Temperature  
Mean Temperature 67 °F 76 °F  
Max Temperature 72 °F 87 °F 98 °F (2009)
Min Temperature 61 °F 64 °F 45 °F (1981)
Degree Days  
Heating Degree Days 0 0  
Month to date heating degree days 0 0  
Since 1 June heating degree days 0 15  
Since 1 July heating degree days 0 0  
Cooling Degree Days 2 11  
Month to date cooling degree days 148 199  
Year to date cooling degree days 962 891  
Since 1 June cooling degree days 823 799  
Growing Degree Days 18 (Base 50)    
Moisture  
Dew Point 61 °F    
Average Humidity 77    
Maximum Humidity 93    
Minimum Humidity 61    
Precipitation  
Precipitation 0.06 in 0.11 in 1.39 in (2010)
Month to date precipitation 1.21 2.14  
Year to date precipitation 27.11 26.61  
Snow  
Snow 0.00 in 0.00 in - ()
Month to date snowfall 0.0 0.0  
Since 1 July snowfall 0.0 0.0  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.21 in    
Wind  
Wind Speed 4 mph (NNE)    
Max Wind Speed 10 mph    
Max Gust Speed 22 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Aug. 18, 2013 Rise Set
Actual Time 6:26 AM EDT 8:00 PM EDT
Civil Twilight 5:57 AM EDT 8:28 PM EDT
Nautical Twilight 5:23 AM EDT 9:02 PM EDT
Astronomical Twilight 4:47 AM EDT 9:38 PM EDT
Moon 6:04 PM EDT (8/18) 3:34 AM EDT (8/18)
Length of Visible Light 14h 30m
Length of Day
13h 33m
Waxing Gibbous, 92% of the Moon is Illuminated
Aug 18
Waxing Gibbous
Aug 20
Full
Aug 28
Last Quarter
Sep 5
New
Sep 12
First Quarter

Hourly Weather History & Observations

Time (EDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:52 AM 70.0 °F 60.1 °F 71% 30.22 in 10.0 mi ENE 3.5 mph - N/A   Overcast
1:52 AM 70.0 °F 61.0 °F 73% 30.22 in 10.0 mi ENE 4.6 mph - N/A   Overcast
2:52 AM 69.1 °F 61.0 °F 75% 30.21 in 10.0 mi NNE 4.6 mph - N/A   Overcast
3:52 AM 68.0 °F 61.0 °F 78% 30.20 in 10.0 mi NE 4.6 mph - N/A   Overcast
4:52 AM 66.9 °F 62.1 °F 84% 30.21 in 10.0 mi NNE 4.6 mph - 0.01 in Rain Light Rain
5:52 AM 66.9 °F 63.0 °F 87% 30.21 in 10.0 mi North 5.8 mph - 0.01 in Rain Light Rain
6:52 AM 66.0 °F 63.0 °F 90% 30.22 in 10.0 mi North 4.6 mph - 0.02 in Rain Light Rain
7:52 AM 66.0 °F 63.0 °F 90% 30.23 in 10.0 mi NE 4.6 mph - 0.00 in   Overcast
8:52 AM 66.9 °F 63.0 °F 87% 30.23 in 10.0 mi Calm Calm - 0.00 in   Overcast
9:13 AM 68.0 °F 62.6 °F 83% 30.24 in 10.0 mi North 4.6 mph - 0.00 in Rain Light Rain
9:52 AM 69.1 °F 63.0 °F 81% 30.25 in 10.0 mi North 4.6 mph - 0.00 in Rain Light Rain
10:52 AM 69.1 °F 62.1 °F 78% 30.25 in 10.0 mi NNE 8.1 mph - 0.00 in Rain Light Rain
11:52 AM 69.1 °F 61.0 °F 75% 30.25 in 10.0 mi North 5.8 mph - 0.02 in Rain Light Rain
12:52 PM 70.0 °F 62.1 °F 76% 30.23 in 10.0 mi NNE 3.5 mph - 0.00 in Rain Light Rain
1:52 PM 71.1 °F 60.1 °F 68% 30.21 in 10.0 mi ENE 5.8 mph - 0.00 in   Overcast
2:52 PM 71.1 °F 57.9 °F 63% 30.21 in 10.0 mi ENE 3.5 mph - N/A   Overcast
3:20 PM 71.6 °F 59.0 °F 64% 30.21 in 10.0 mi Calm Calm - N/A   Overcast
3:52 PM 70.0 °F 61.0 °F 73% 30.19 in 10.0 mi WNW 4.6 mph - N/A   Overcast
4:52 PM 70.0 °F 60.1 °F 71% 30.20 in 10.0 mi Variable 5.8 mph - N/A   Overcast
5:52 PM 68.0 °F 61.0 °F 78% 30.20 in 10.0 mi NW 6.9 mph - N/A   Overcast
6:52 PM 69.1 °F 61.0 °F 75% 30.19 in 10.0 mi North 3.5 mph - N/A   Overcast
7:26 PM 69.8 °F 60.8 °F 73% 30.19 in 10.0 mi North 3.5 mph - N/A   Overcast
7:52 PM 68.0 °F 61.0 °F 78% 30.19 in 10.0 mi WNW 4.6 mph - N/A   Mostly Cloudy
8:52 PM 66.9 °F 61.0 °F 81% 30.19 in 10.0 mi WNW 5.8 mph - N/A   Mostly Cloudy
9:52 PM 64.9 °F 61.0 °F 87% 30.20 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
10:52 PM 64.0 °F 60.1 °F 87% 30.20 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
11:52 PM 62.1 °F 60.1 °F 93% 30.19 in 10.0 mi Calm Calm - N/A   Mostly Cloudy