HERNDON, VIRGINIA

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Elevation: 98 meters Latitude: 38 57N Longitude: 077 27W

WEATHER

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DAILY WEATHER AVERAGE - 12 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	3.4 ^°C	7.9 ^°C	-1.2 ^°C	21.7 ^°C (2015)	-7.8 ^°C (1995)
Dewpoint	-2.2 ^°C	1.1 ^°C	-5.9 ^°C	12.8 ^°C (2015)	-14.4 ^°C (2009)
Humidity	69.5 ^%	87.8 ^%	50.3 ^%		25 ^% (2009)
Barometer	1021.3 ^hPa	1026.4 ^hPa	1016.6 ^hPa	1037.3 ^hPa (2011)	991.2 ^hPa (2010)
Wind Speed	10.6 ^km/h	21.4 ^km/h		51.8 ^km/h (2000)
Wind Gust		46 ^km/h		70.3 ^km/h (2000)
Precipitation	4.32 ^mm			13.97 ^mm (2010)

Weather Element	Average
Visibility	14.2 ^km
Wind Direction	SSW (217.5 °)

Weather Element	Total
Heating Degree Days	15 (Base 18.3)
Growing Degree Days	2.1 (Base 10)

Total Years on Record: 21

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