HERNDON, VIRGINIA

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

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DAILY WEATHER AVERAGE - 11 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	3.4 ^°C	7.8 ^°C	-1.1 ^°C	17.2 ^°C (2015)	-9.4 ^°C (1995)
Dewpoint	-2.1 ^°C	1.1 ^°C	-5.8 ^°C	12.2 ^°C (2003)	-20.6 ^°C (2006)
Humidity	71.5 ^%	88.8 ^%	51.3 ^%		13 ^% (2006)
Barometer	1018.6 ^hPa	1022.7 ^hPa	1013.9 ^hPa	1039.6 ^hPa (2011)	992.6 ^hPa (2003)
Wind Speed	10 ^km/h	23.2 ^km/h		50.1 ^km/h (2003)
Wind Gust		43.8 ^km/h		64.9 ^km/h (2003)
Precipitation	22.35 ^mm			84.58 ^mm (2003)

Weather Element	Average
Visibility	13.4 ^km
Wind Direction	SW (225 °)

Weather Element	Total
Heating Degree Days	15 (Base 18.3)

Total Years on Record: 21

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