Weather History for KIAD - August, 2014

Change the Weather History Date:

Thursday, August 21, 2014

  Actual Average Record
Temperature  
Mean Temperature 74 °F 75 °F  
Max Temperature 85 °F 86 °F 94 °F (2009)
Min Temperature 62 °F 64 °F 47 °F (1976)
Degree Days  
Heating Degree Days 0 0  
Month to date heating degree days 0 0  
Since 1 June heating degree days 5 15  
Since 1 July heating degree days 3 0  
Cooling Degree Days 9 10  
Month to date cooling degree days 153 229  
Year to date cooling degree days 767 921  
Since 1 June cooling degree days 681 829  
Growing Degree Days 23 (Base 50)    
Moisture  
Dew Point 67 °F    
Average Humidity 80    
Maximum Humidity 100    
Minimum Humidity 59    
Precipitation  
Precipitation 1.43 in 0.10 in 1.42 in (1973)
Month to date precipitation 3.85 2.47  
Year to date precipitation 34.91 26.94  
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 30.02 in    
Wind  
Wind Speed 2 mph (South)    
Max Wind Speed 31 mph    
Max Gust Speed 47 mph    
Visibility 6 miles    
Events Fog , Rain , Thunderstorm    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

Daily Weather History Graph

Daily Weather History Graph

Search for Another Location

Airport or City:

Trip Planner

Search our weather history database for the weather conditions in past years. The results will help you decide how hot, cold, wet, or windy it might be!

Date:

Astronomy

Aug. 21, 2014 Rise Set
Actual Time 6:28 AM EDT 7:56 PM EDT
Civil Twilight 6:00 AM EDT 8:24 PM EDT
Nautical Twilight 5:26 AM EDT 8:57 PM EDT
Astronomical Twilight 4:51 AM EDT 9:33 PM EDT
Moon 2:58 AM EDT (8/21) 5:22 PM EDT (8/21)
Length of Visible Light 14h 23m
Length of Day
13h 27m
Waning Crescent, 13% of the Moon is Illuminated
Aug 21
Waning Crescent
Aug 25
New
Sep 2
First Quarter
Sep 8
Full
Sep 15
Last Quarter

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 64.9 °F - 64.0 °F 97% 30.01 in 10.0 mi East 3.5 mph - N/A   Scattered Clouds
1:52 AM 64.9 °F - 64.0 °F 97% 30.00 in 10.0 mi ESE 3.5 mph - N/A   Partly Cloudy
2:52 AM 64.9 °F - 64.0 °F 97% 29.99 in 10.0 mi Calm Calm - N/A   Partly Cloudy
3:52 AM 63.0 °F - 63.0 °F 100% 29.99 in 10.0 mi Calm Calm - N/A   Clear
4:52 AM 63.0 °F - 62.1 °F 97% 30.00 in 9.0 mi Calm Calm - N/A   Clear
5:39 AM 62.6 °F - 62.6 °F 100% 30.02 in 1.8 mi Calm Calm - N/A   Clear
5:47 AM 62.6 °F - 62.6 °F 100% 30.02 in 5.0 mi Calm Calm - N/A   Scattered Clouds
5:52 AM 62.1 °F - 62.1 °F 100% 30.01 in 5.0 mi Calm Calm - N/A Fog Scattered Clouds
6:27 AM 62.6 °F - 62.6 °F 100% 30.04 in 5.0 mi NW 3.5 mph - N/A Fog Patches of Fog
6:50 AM 64.4 °F - 64.4 °F 100% 30.05 in 0.0 mi Calm Calm - N/A Fog Patches of Fog
6:52 AM 64.0 °F - 64.0 °F 100% 30.04 in 0.0 mi Calm Calm - N/A Fog Patches of Fog
6:57 AM 64.4 °F - 64.4 °F 100% 30.05 in 0.0 mi Calm Calm - N/A Fog Fog
7:20 AM 64.4 °F - 64.4 °F 100% 30.05 in 0.8 mi Calm Calm - N/A Fog Patches of Fog
7:52 AM 66.0 °F - 64.9 °F 96% 30.05 in 0.5 mi Calm Calm - N/A Fog Patches of Fog
8:52 AM 66.9 °F - 66.0 °F 97% 30.06 in 0.5 mi Calm Calm - N/A Fog Patches of Fog
9:05 AM 66.2 °F - 66.2 °F 100% 30.06 in 1.2 mi Calm Calm - N/A Fog Patches of Fog
9:20 AM 68.0 °F - 66.2 °F 94% 30.06 in 3.0 mi Calm Calm - N/A Fog Patches of Fog
9:52 AM 72.0 °F - 68.0 °F 87% 30.06 in 3.0 mi WSW 3.5 mph - N/A Fog Patches of Fog
10:02 AM 69.8 °F - 68.0 °F 94% 30.07 in 3.0 mi SW 4.6 mph - N/A Fog Patches of Fog
10:52 AM 75.0 °F - 70.0 °F 84% 30.06 in 6.0 mi Calm Calm - N/A   Haze
11:52 AM 79.0 °F - 70.0 °F 74% 30.04 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
12:52 PM 84.0 °F 88.4 °F 70.0 °F 63% 30.04 in 10.0 mi Variable 4.6 mph - N/A   Mostly Cloudy
1:52 PM 84.9 °F 88.2 °F 68.0 °F 57% 30.02 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
2:52 PM 84.0 °F 89.0 °F 71.1 °F 65% 30.00 in 10.0 mi South 5.8 mph - N/A   Mostly Cloudy
3:52 PM 84.0 °F 87.8 °F 69.1 °F 61% 29.99 in 10.0 mi SW 5.8 mph - N/A   Overcast
4:14 PM 82.4 °F 86.3 °F 69.8 °F 66% 29.99 in 10.0 mi SSW 3.5 mph - N/A Thunderstorm Thunderstorm
4:29 PM 82.4 °F 86.3 °F 69.8 °F 66% 30.00 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
4:35 PM 80.6 °F 84.6 °F 71.6 °F 74% 30.00 in 2.0 mi North 12.7 mph 26.5 mph 0.00 in Rain , Thunderstorm Light Thunderstorms and Rain
4:40 PM 73.4 °F - 69.8 °F 88% 30.04 in 0.2 mi NNW 28.8 mph 41.4 mph 0.12 in Fog , Rain , Thunderstorm Thunderstorms and Rain
4:43 PM 69.8 °F - 64.4 °F 83% 30.06 in 0.2 mi NNW 21.9 mph 41.4 mph 0.26 in Rain , Thunderstorm Heavy Thunderstorms and Rain
4:47 PM 69.8 °F - 64.4 °F 83% 30.07 in 0.1 mi NNW 15.0 mph 41.4 mph 0.46 in Rain , Thunderstorm Heavy Thunderstorms and Rain
4:52 PM 70.0 °F - 64.9 °F 84% 30.01 in 0.1 mi ESE 16.1 mph 40.3 mph 0.98 in Rain , Thunderstorm Heavy Thunderstorms and Rain
4:55 PM 69.8 °F - 64.4 °F 83% 30.01 in 0.1 mi ESE 21.9 mph 47.2 mph 0.39 in Rain , Thunderstorm Heavy Thunderstorms and Rain
5:03 PM 73.4 °F - 66.2 °F 78% 30.01 in 5.0 mi ESE 15.0 mph 25.3 mph 0.40 in Rain , Thunderstorm Light Thunderstorms and Rain
5:10 PM 73.4 °F - 68.0 °F 83% 30.01 in 7.0 mi SSE 8.1 mph 19.6 mph 0.40 in   Overcast
5:27 PM 71.6 °F - 69.8 °F 94% 30.01 in 3.0 mi SSE 5.8 mph - 0.40 in Rain Light Rain
5:44 PM 71.6 °F - 69.8 °F 94% 30.02 in 3.0 mi SSE 3.5 mph - 0.44 in Rain , Thunderstorm Light Thunderstorms and Rain
5:52 PM 72.0 °F - 70.0 °F 93% 30.01 in 3.0 mi South 9.2 mph - 0.44 in Rain , Thunderstorm Light Thunderstorms and Rain
6:24 PM 73.4 °F - 69.8 °F 88% 29.99 in 8.0 mi SSE 5.8 mph - 0.01 in   Overcast
6:52 PM 73.0 °F - 71.1 °F 93% 29.99 in 8.0 mi Calm Calm - 0.01 in   Overcast
7:24 PM 73.4 °F - 71.6 °F 94% 30.00 in 7.0 mi NNW 5.8 mph - N/A   Overcast
7:32 PM 73.4 °F - 71.6 °F 94% 30.01 in 7.0 mi Variable 5.8 mph - N/A Thunderstorm Thunderstorm
7:52 PM 73.0 °F - 70.0 °F 90% 30.00 in 7.0 mi SSE 5.8 mph - 0.00 in Thunderstorm Thunderstorm
8:20 PM 73.4 °F - 69.8 °F 88% 29.99 in 10.0 mi SSE 4.6 mph - N/A   Overcast
8:52 PM 72.0 °F - 70.0 °F 93% 29.99 in 8.0 mi South 3.5 mph - N/A   Overcast
9:01 PM 71.6 °F - 69.8 °F 94% 30.00 in 8.0 mi SW 3.5 mph - N/A   Overcast
9:52 PM 72.0 °F - 71.1 °F 97% 30.00 in 8.0 mi Calm Calm - N/A   Overcast
10:52 PM 71.6 °F - 69.8 °F 94% 30.00 in 7.0 mi Calm Calm - N/A   Overcast
11:52 PM 72.0 °F - 71.1 °F 97% 30.00 in 8.0 mi Calm Calm - N/A   Scattered Clouds