HERNDON, VIRGINIA

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

WEATHER

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DAILY WEATHER AVERAGE - 20 MARCH

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	7.9 ^°C	12.7 ^°C	2.8 ^°C	24.4 ^°C (2010)	-3.9 ^°C (2001)
Dewpoint	0.5 ^°C	4.8 ^°C	-2.6 ^°C	16.1 ^°C (2008)	-12.8 ^°C (2010)
Humidity	65 ^%	87.2 ^%	43.8 ^%		19 ^% (2010)
Barometer	1017.9 ^hPa	1022.7 ^hPa	1012.5 ^hPa	1037.9 ^hPa (2011)	989.5 ^hPa (1996)
Wind Speed	14.2 ^km/h	27.5 ^km/h		51.8 ^km/h (2008)
Wind Gust		42.8 ^km/h		66.6 ^km/h (2008)
Precipitation	26.92 ^mm			90.93 ^mm (2003)

Weather Element	Average
Visibility	14.2 ^km
Wind Direction	S (178.9 °)

Weather Element	Total
Heating Degree Days	10.6 (Base 18.3)
Growing Degree Days	3.4 (Base 10)

Total Years on Record: 21

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