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Fairfax County Weather

 
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The average temperature of Fairfax County is 54.77°F, which is about the same as the Virginia average temperature of 55.54°F and is about the same as the national average temperature of 54.45°F.

Topics:Heating Cost IndexCooling Cost IndexHistorical TemperatureHistorical PrecipitationHistorical SnowHistorical HumidityHistorical Wind Speed

Historical Weather

Heating Cost Index, #82

Fairfax County
212.09
Virginia
200.82
U.S.
212.91

Cooling Cost Index, #66

Fairfax County
130.21
Virginia
126.27
U.S.
139.42

The Heating Cost Index and the Cooling Cost Index are indicators of the relative heating and cooling cost of an area. They were calculated based on the average temperate and duration of the hot and cold days for the area. Please note, the actual heating cost and cooling cost are also dependent on other factors specific to individual residences such as the size of the house, the insulation condition, and the equipment efficiency, etc.

Average Temperature

Annual Average Temperature, #79
Fairfax County
54.8 °F
Virginia
55.5 °F
U.S.
54.5 °F

Ranks: Average Max. Temperature: #90, Average Min. Temperature: #60

Precipitation

Average Annual Precipitation, #99
Fairfax County
41.34 inches
Virginia
42.76 inches
U.S.
38.67 inches


Average Number of Days with 0.1 Inch or More Precipitation in a Year (this gives an indication of the number of days in a year that it is useful to have an umbrella), #89
Fairfax County
72.55 days
Virginia
74.79 days
U.S.
66.51 days


Snow

Average Annual Snowfall, #50
Fairfax County
18.07 inches
Virginia
14.85 inches
U.S.
23.27 inches


Average Number of Days with 1 Inch or More Snow Depth in a Year, #26
Fairfax County
17.97 days
Virginia
11.43 days
U.S.
27.17 days


Humidity

Annual Average Humidity, #36
Fairfax County
78.13%
Virginia
76.77%
U.S.
77.52%


Wind Speed

Annual Average Wind Speed, #4
Fairfax County
27.22 mph
Virginia
19.32 mph
U.S.
16.93 mph


* The temperature, snow fall, and precipitation information on this page were calculated from the historical data of 18,000+ U.S weather stations for the period of time from 1980 to 2010. The humidity and wind speed information were calculated from data from 15,000 worldwide stations for the period of time from 1980 to 2010.


 
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