Dulles Airport, VA

5:46 AM EDT on March 27, 2017 (GMT -0400)
Washington Dulles International

Weather History for KIAD - September, 2013

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Wednesday, September 11, 2013

  Actual Average Record
Temperature  
Mean Temperature 83 °F 70 °F  
Max Temperature 94 °F 81 °F 99 °F (1983)
Min Temperature 71 °F 58 °F 40 °F (1976)
Degree Days  
Heating Degree Days 0 1  
Month to date heating degree days 0 4  
Since 1 July heating degree days 0 6  
Cooling Degree Days 18 6  
Month to date cooling degree days 109 77  
Year to date cooling degree days 1200 1093  
Growing Degree Days 32 (Base 50)    
Moisture  
Dew Point 70 °F    
Average Humidity 69    
Maximum Humidity 93    
Minimum Humidity 44    
Precipitation  
Precipitation 0.00 in 0.13 in 0.72 in (1987)
Month to date precipitation 0.21 1.32  
Year to date precipitation 28.06 29.32  
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 30.09 in    
Wind  
Wind Speed 5 mph (South)    
Max Wind Speed 15 mph    
Max Gust Speed 37 mph    
Visibility 9 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

Daily Weather History Graph

Daily Weather History Graph

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Date:

Astronomy

Sep. 11, 2013 Rise Set
Actual Time 6:47 AM EDT 7:24 PM EDT
Civil Twilight 6:20 AM EDT 7:51 PM EDT
Nautical Twilight 5:49 AM EDT 8:22 PM EDT
Astronomical Twilight 5:16 AM EDT 8:55 PM EDT
Moon 1:10 PM EDT (9/11) 11:21 PM EDT (9/11)
Length of Visible Light 13h 30m
Length of Day
12h 36m
Waxing Crescent, 38% of the Moon is Illuminated
Sep 11
Waxing Crescent
Sep 12
First Quarter
Sep 19
Full
Sep 26
Last Quarter
Oct 4
New

Hourly Weather History & Observations

Time (EDT) Temp. Heat Index Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:52 AM 77.0 °F - 72.0 °F 84% 30.14 in 9.0 mi South 4.6 mph - N/A   Clear
1:52 AM 75.9 °F - 72.0 °F 87% 30.13 in 9.0 mi South 3.5 mph - N/A   Clear
2:52 AM 77.0 °F - 72.0 °F 84% 30.13 in 9.0 mi South 3.5 mph - N/A   Mostly Cloudy
3:52 AM 73.9 °F - 71.1 °F 91% 30.12 in 7.0 mi Calm Calm - N/A   Clear
4:52 AM 73.0 °F - 70.0 °F 90% 30.11 in 6.0 mi Calm Calm - N/A   Clear
5:52 AM 72.0 °F - 70.0 °F 93% 30.12 in 5.0 mi Calm Calm - N/A   Clear
6:52 AM 71.1 °F - 70.0 °F 96% 30.13 in 5.0 mi Calm Calm - N/A   Partly Cloudy
7:00 AM 71.6 °F - 69.8 °F 94% 30.15 in 7.0 mi Calm Calm - N/A   Partly Cloudy
7:52 AM 73.9 °F - 72.0 °F 93% 30.15 in 4.0 mi South 3.5 mph - N/A   Scattered Clouds
8:52 AM 78.1 °F - 72.0 °F 81% 30.15 in 6.0 mi WSW 3.5 mph - N/A   Haze
9:52 AM 84.9 °F 90.1 °F 71.1 °F 63% 30.15 in 9.0 mi Calm Calm - N/A   Scattered Clouds
10:52 AM 89.1 °F 94.1 °F 70.0 °F 53% 30.14 in 10.0 mi Calm Calm - N/A   Scattered Clouds
11:52 AM 91.9 °F 97.4 °F 70.0 °F 48% 30.12 in 10.0 mi Variable 4.6 mph - N/A   Mostly Cloudy
12:52 PM 91.0 °F 97.6 °F 71.1 °F 52% 30.11 in 10.0 mi South 8.1 mph - N/A   Mostly Cloudy
1:52 PM 91.9 °F 97.4 °F 70.0 °F 48% 30.08 in 10.0 mi SE 10.4 mph - 0.01 in   Mostly Cloudy
2:52 PM 91.9 °F 97.4 °F 70.0 °F 48% 30.05 in 10.0 mi SE 9.2 mph 17.3 mph N/A   Partly Cloudy
3:52 PM 91.9 °F 96.9 °F 69.1 °F 47% 30.04 in 10.0 mi SSE 12.7 mph - N/A   Partly Cloudy
4:52 PM 91.9 °F 95.9 °F 68.0 °F 45% 30.02 in 10.0 mi South 9.2 mph 19.6 mph N/A   Partly Cloudy
5:52 PM 91.0 °F 94.3 °F 66.9 °F 45% 30.02 in 10.0 mi SSW 10.4 mph - N/A   Clear
6:52 PM 88.0 °F 92.1 °F 69.1 °F 53% 30.02 in 10.0 mi South 8.1 mph - N/A   Partly Cloudy
7:52 PM 84.9 °F 89.4 °F 70.0 °F 61% 30.04 in 10.0 mi South 8.1 mph - N/A   Mostly Cloudy
8:52 PM 82.9 °F 87.0 °F 70.0 °F 65% 30.04 in 10.0 mi South 9.2 mph - N/A   Mostly Cloudy
9:52 PM 81.0 °F 84.4 °F 70.0 °F 69% 30.03 in 10.0 mi South 8.1 mph - N/A   Clear
10:52 PM 81.0 °F 84.4 °F 70.0 °F 69% 30.02 in 10.0 mi South 5.8 mph - N/A   Scattered Clouds
11:52 PM 79.0 °F - 69.1 °F 72% 30.01 in 10.0 mi SSW 5.8 mph - N/A   Mostly Cloudy