Washington Dulles International, VA

10:33 PM EDT on June 23, 2018 (GMT -0400)
Washington Dulles International

Weather History for KIAD - July, 1997

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Tuesday, July 22, 1997

  Actual Average (KIAD) Record (KIAD)
Temperature  
Mean Temperature 78 °F 77 °F  
Max Temperature 87 °F 88 °F 105 °F (2011)
Min Temperature 72 °F 66 °F 50 °F (1974)
Degree Days  
Heating Degree Days 0 0  
Month to date heating degree days 0  
Since 1 June heating degree days 15  
Since 1 July heating degree days 0  
Cooling Degree Days 13 12  
Month to date cooling degree days 259  
Year to date cooling degree days 588  
Since 1 June cooling degree days 496  
Growing Degree Days 28 (Base 50)    
Moisture  
Dew Point 68 °F    
Average Humidity 77    
Maximum Humidity 94    
Minimum Humidity 51    
Precipitation  
Precipitation 0.16 in 0.12 in 2.25 in (1969)
Month to date precipitation 2.58  
Year to date precipitation 23.38  
Snow  
Snow 0.00 in 0.00 in - ()
Month to date snowfall 0.0  
Since 1 July snowfall 0.0  
Snow Depth -    
Sea Level Pressure  
Sea Level Pressure 30.05 in    
Wind  
Wind Speed 5 mph (NNE)    
Max Wind Speed 13 mph    
Max Gust Speed 18 mph    
Visibility 8 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

Daily Weather History Graph

Daily Weather History Graph

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Astronomy

Jul. 22, 1997 Rise Set
Actual Time 6:02 AM EDT 8:29 PM EDT
Civil Twilight 5:31 AM EDT 9:00 PM EDT
Nautical Twilight 4:53 AM EDT 9:38 PM EDT
Astronomical Twilight 4:11 AM EDT 10:20 PM EDT
Moon 10:17 PM EDT (7/22) 8:55 AM EDT (7/22)
Length of Visible Light 15h 28m
Length of Day
14h 27m
Waning Gibbous, 91% of the Moon is Illuminated
Jul 22
Waning Gibbous
Jul 26
Last Quarter
Aug 3
New
Aug 11
First Quarter
Aug 18
Full

Hourly Weather History & Observations

Time (EDT) Temp. Heat Index Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:51 AM 75.0 °F - 71.1 °F 87% 29.97 in 5.0 mi South 4.6 mph - N/A   Mostly Cloudy
1:51 AM 73.9 °F - 70.0 °F 87% 29.97 in 6.0 mi Calm Calm - N/A   Mostly Cloudy
2:51 AM 73.0 °F - 70.0 °F 90% 29.98 in 5.0 mi Calm Calm - N/A   Mostly Cloudy
3:51 AM 72.0 °F - 69.1 °F 91% 29.98 in 5.0 mi Calm Calm - N/A   Scattered Clouds
4:51 AM 73.0 °F - 64.0 °F 73% 30.00 in 10.0 mi North 12.7 mph 18.4 mph N/A   Clear
5:51 AM 72.0 °F - 62.1 °F 71% 30.01 in 10.0 mi NNE 9.2 mph - N/A   Mostly Cloudy
6:51 AM 73.0 °F - 64.0 °F 73% 30.03 in 10.0 mi North 6.9 mph - N/A   Mostly Cloudy
7:51 AM 73.9 °F - 64.0 °F 71% 30.05 in 10.0 mi North 9.2 mph - N/A   Mostly Cloudy
8:51 AM 78.1 °F - 64.0 °F 62% 30.06 in 10.0 mi NNE 9.2 mph - N/A   Mostly Cloudy
9:51 AM 80.1 °F 81.7 °F 64.0 °F 58% 30.06 in 10.0 mi NNE 11.5 mph - N/A   Scattered Clouds
10:51 AM 82.0 °F 83.4 °F 64.0 °F 54% 30.06 in 10.0 mi ENE 8.1 mph - N/A   Mostly Cloudy
11:51 AM 84.9 °F 86.6 °F 64.9 °F 51% 30.06 in 10.0 mi ENE 11.5 mph - N/A   Mostly Cloudy
12:51 PM 84.9 °F 86.6 °F 64.9 °F 51% 30.06 in 10.0 mi Variable 4.6 mph - N/A   Overcast
1:51 PM 84.0 °F 86.3 °F 66.0 °F 55% 30.05 in 10.0 mi ENE 5.8 mph - N/A   Overcast
2:26 PM 80.6 °F 83.2 °F 68.0 °F 65% 30.07 in 1.5 mi NNW 6.9 mph - 0.02 in Rain Heavy Rain
2:32 PM 77.0 °F - 69.8 °F 78% 30.08 in 2.0 mi NW 11.5 mph - 0.05 in Rain Rain
2:39 PM 75.2 °F - 69.8 °F 83% 30.08 in 4.0 mi North 8.1 mph - 0.10 in Rain Rain
2:51 PM 75.0 °F - 71.1 °F 87% 30.07 in 5.0 mi North 5.8 mph - 0.12 in Rain Rain
3:03 PM 73.4 °F - 71.6 °F 94% 30.07 in 4.0 mi NW 6.9 mph - 0.02 in Rain Rain
3:38 PM 75.2 °F - 71.6 °F 89% 30.05 in 9.0 mi North 4.6 mph - 0.04 in Rain Light Rain
3:51 PM 75.9 °F - 70.0 °F 82% 30.05 in 8.0 mi NNE 3.5 mph - 0.04 in Rain Light Rain
4:51 PM 78.1 °F - 71.1 °F 79% 30.06 in 9.0 mi NNE 4.6 mph - 0.00 in   Overcast
5:51 PM 77.0 °F - 71.1 °F 82% 30.06 in 7.0 mi NE 5.8 mph - 0.00 in   Overcast
6:01 PM 75.2 °F - 71.6 °F 89% 30.06 in 8.0 mi South 6.9 mph - N/A   Overcast
6:32 PM 75.2 °F - 69.8 °F 83% 30.06 in 8.0 mi South 5.8 mph - N/A   Overcast
6:51 PM 75.0 °F - 69.1 °F 82% 30.06 in 9.0 mi SE 5.8 mph - N/A   Overcast
7:51 PM 75.0 °F - 69.1 °F 82% 30.07 in 6.0 mi South 3.5 mph - N/A   Haze
8:51 PM 75.0 °F - 69.1 °F 82% 30.08 in 8.0 mi SE 4.6 mph - N/A   Overcast
9:51 PM 75.0 °F - 69.1 °F 82% 30.07 in 8.0 mi Calm Calm - N/A   Overcast
10:05 PM 73.4 °F - 69.8 °F 88% 30.08 in 9.0 mi Calm Calm - N/A   Overcast
10:51 PM 73.9 °F - 70.0 °F 87% 30.07 in 8.0 mi Calm Calm - N/A   Overcast
11:51 PM 73.9 °F - 70.0 °F 87% 30.06 in 6.0 mi Calm Calm - N/A   Overcast