Dulles Airport, VA

1:53 AM EDT on October 21, 2019 (GMT -0400)
Washington Dulles International

Weather History for KIAD - September, 2019

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Tuesday, September 17, 2019

  Actual Average Record
Temperature  
Mean Temperature 71 °F 68 °F  
Max Temperature 80 °F 79 °F 97 °F (1991)
Min Temperature 61 °F 56 °F 35 °F (1986)
Degree Days  
Heating Degree Days 0 2  
Month to date heating degree days 0 12  
Since 1 July heating degree days 0 14  
Cooling Degree Days 6 4  
Month to date cooling degree days 160 105  
Year to date cooling degree days 1395 1121  
Growing Degree Days 21 (Base 50)    
Moisture  
Dew Point 61 °F    
Average Humidity 65    
Maximum Humidity 84    
Minimum Humidity 45    
Precipitation  
Precipitation 0.00 in 0.14 in 1.71 in (2004)
Month to date precipitation 0.33 2.17  
Year to date precipitation 30.17 30.17  
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 30.08 in    
Wind  
Wind Speed 7 mph (NE)    
Max Wind Speed 16 mph    
Max Gust Speed 19 mph    
Visibility 10 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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Astronomy

Sep. 17, 2019 Rise Set
Actual Time 6:52 AM EDT 7:15 PM EDT
Civil Twilight 6:26 AM EDT 7:41 PM EDT
Nautical Twilight 5:54 AM EDT 8:13 PM EDT
Astronomical Twilight 5:22 AM EDT 8:45 PM EDT
Moon 9:19 PM EDT (9/17) 9:53 AM EDT (9/17)
Length of Visible Light 13h 15m
Length of Day
12h 22m
Waning Gibbous, 89% of the Moon is Illuminated
Sep 17
Waning Gibbous
Sep 21
Last Quarter
Sep 28
New
Oct 5
First Quarter
Oct 13
Full

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 75.0 °F - 63.0 °F 66% 30.00 in 10.0 mi NNE 6.9 mph - N/A   Mostly Cloudy
1:52 AM 73.9 °F - 63.0 °F 68% 30.01 in 10.0 mi NE 5.8 mph - N/A   Mostly Cloudy
2:52 AM 73.0 °F - 63.0 °F 71% 30.01 in 10.0 mi NNE 9.2 mph - N/A   Mostly Cloudy
3:52 AM 71.1 °F - 62.1 °F 73% 30.00 in 10.0 mi NNE 8.1 mph - N/A   Mostly Cloudy
5:52 AM 70.0 °F - 63.0 °F 78% 30.02 in 10.0 mi NNE 8.1 mph - N/A   Mostly Cloudy
6:52 AM 70.0 °F - 64.0 °F 81% 30.04 in 10.0 mi NNE 8.1 mph - N/A   Overcast
6:59 AM 70.0 °F - 64.0 °F 81% 30.06 in 10.0 mi NNE 8.1 mph - N/A   Overcast
7:24 AM 70.0 °F - 64.0 °F 81% 30.06 in 10.0 mi NNE 10.4 mph - N/A   Overcast
7:52 AM 70.0 °F - 64.9 °F 84% 30.07 in 10.0 mi NNE 10.4 mph - N/A   Overcast
8:45 AM 71.1 °F - 63.0 °F 75% 30.09 in 10.0 mi NE 9.2 mph - N/A   Overcast
8:52 AM 71.1 °F - 63.0 °F 75% 30.09 in 10.0 mi NE 11.5 mph - N/A   Mostly Cloudy
10:52 AM 73.9 °F - 63.0 °F 68% 30.12 in 10.0 mi NE 10.4 mph - N/A   Overcast
11:21 AM 73.0 °F - 63.0 °F 71% 30.13 in 10.0 mi NE 10.4 mph - N/A   Overcast
11:52 AM 73.9 °F - 62.1 °F 66% 30.12 in 10.0 mi ENE 9.2 mph - N/A   Overcast
12:03 PM 75.0 °F - 61.0 °F 62% 30.13 in 10.0 mi ENE 6.9 mph - N/A   Overcast
12:52 PM 75.9 °F - 60.1 °F 58% 30.12 in 10.0 mi Variable 3.5 mph 16.1 mph N/A   Mostly Cloudy
1:52 PM 78.1 °F - 57.9 °F 50% 30.11 in 10.0 mi NE 5.8 mph - N/A   Mostly Cloudy
2:52 PM 78.1 °F - 57.9 °F 50% 30.09 in 10.0 mi NE 5.8 mph - N/A   Mostly Cloudy
3:52 PM 80.1 °F 80.4 °F 57.0 °F 45% 30.08 in 10.0 mi Variable 4.6 mph - N/A   Scattered Clouds
4:52 PM 78.1 °F - 57.9 °F 50% 30.07 in 10.0 mi NE 10.4 mph - N/A   Scattered Clouds
5:52 PM 78.1 °F - 57.0 °F 48% 30.07 in 10.0 mi NE 10.4 mph - N/A   Scattered Clouds
6:52 PM 73.9 °F - 57.0 °F 55% 30.08 in 10.0 mi ENE 5.8 mph - N/A   Partly Cloudy
7:52 PM 72.0 °F - 57.9 °F 61% 30.09 in 10.0 mi NE 6.9 mph - N/A   Scattered Clouds
8:52 PM 70.0 °F - 57.0 °F 63% 30.11 in 10.0 mi East 5.8 mph - N/A   Scattered Clouds
9:52 PM 66.0 °F - 57.0 °F 73% 30.12 in 10.0 mi Calm Calm - N/A   Partly Cloudy
10:52 PM 62.1 °F - 57.0 °F 84% 30.12 in 10.0 mi Calm Calm - N/A   Partly Cloudy
11:52 PM 64.0 °F - 57.0 °F 78% 30.12 in 10.0 mi NNE 5.8 mph - N/A   Clear