HERNDON, VIRGINIA

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

WEATHER

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DAILY WEATHER AVERAGE - DECEMBER 19

[ °C ] °F

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	36.2 ^°F	43.9 ^°F	27.7 ^°F	61 ^°F (1997)	17.1 ^°F (2004)
Dewpoint	26 ^°F	31 ^°F	19.1 ^°F	48.9 ^°F (2002)	-4 ^°F (2013)
Humidity	69.3 ^%	86.7 ^%	51.5 ^%		28 ^% (1997)
Barometer	30.05 ⁱⁿ	30.18 ⁱⁿ	29.94 ⁱⁿ	30.46 ⁱⁿ (2006)	29.53 ⁱⁿ (1995)
Wind Speed	7.8 ^mph	15.1 ^mph		26.5 ^mph (2004)
Wind Gust		23.5 ^mph		36.8 ^mph (2004)
Precipitation	0.29 ⁱⁿ			0.85 ⁱⁿ (2009)

Weather Element	Average
Visibility	8 ^mi
Wind Direction	SW (222.1 °)

Weather Element	Total
Heating Degree Days	29.2 (Base 18.3)

Total Years on Record: 21

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