HERNDON, VIRGINIA

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Elevation: 322 feet Latitude: 38 57N Longitude: 077 27W

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DAILY WEATHER AVERAGE - DECEMBER 12

[ °C ] °F

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	38.2 ^°F	46.2 ^°F	29.8 ^°F	71.1 ^°F (2015)	18 ^°F (1995)
Dewpoint	28.1 ^°F	34 ^°F	21.4 ^°F	55 ^°F (2015)	6.1 ^°F (2009)
Humidity	69.5 ^%	87.8 ^%	50.3 ^%		25 ^% (2009)
Barometer	30.16 ⁱⁿ	30.31 ⁱⁿ	30.02 ⁱⁿ	30.63 ⁱⁿ (2011)	29.27 ⁱⁿ (2010)
Wind Speed	6.6 ^mph	13.3 ^mph		32.2 ^mph (2000)
Wind Gust		28.6 ^mph		43.7 ^mph (2000)
Precipitation	0.17 ⁱⁿ			0.55 ⁱⁿ (2010)

Weather Element	Average
Visibility	8.8 ^mi
Wind Direction	SSW (217.5 °)

Weather Element	Total
Heating Degree Days	27 (Base 18.3)
Growing Degree Days	3.8 (Base 10)

Total Years on Record: 21

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