HERNDON, VIRGINIA

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

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DAILY WEATHER AVERAGE - 9 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	2.4 ^°C	6.4 ^°C	-1.8 ^°C	13 ^°C (1999)	-8.9 ^°C (2002)
Dewpoint	-1.7 ^°C	1.2 ^°C	-5.4 ^°C	10 ^°C (2012)	-15 ^°C (2006)
Humidity	76.9 ^%	92.7 ^%	56.7 ^%		27 ^% (2006)
Barometer	1021.7 ^hPa	1026.4 ^hPa	1017.3 ^hPa	1037.9 ^hPa (2002)	990.5 ^hPa (2009)
Wind Speed	8.4 ^km/h	20.4 ^km/h		40.7 ^km/h (2005)
Wind Gust		40.1 ^km/h		55.5 ^km/h (2009)
Precipitation	12.95 ^mm			36.07 ^mm (2005)

Weather Element	Average
Visibility	11.7 ^km
Wind Direction	SSW (214.1 °)

Weather Element	Total
Heating Degree Days	16.1 (Base 18.3)

Total Years on Record: 21

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