HERNDON, VIRGINIA

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

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DAILY WEATHER AVERAGE - 18 JANUARY

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	0 ^°C	3.9 ^°C	-4.1 ^°C	16.1 ^°C (2006)	-15 ^°C (2003)
Dewpoint	-5.9 ^°C	-0.9 ^°C	-10.3 ^°C	15 ^°C (2006)	-25.6 ^°C (2000)
Humidity	68.2 ^%	87.6 ^%	49.6 ^%		24 ^% (2000)
Barometer	1017.9 ^hPa	1023.7 ^hPa	1011.9 ^hPa	1040.6 ^hPa (2005)	996.6 ^hPa (2004)
Wind Speed	12.6 ^km/h	27 ^km/h		50.1 ^km/h (2012)
Wind Gust		48 ^km/h		70.3 ^km/h (2012)
Precipitation	14.73 ^mm			33.53 ^mm (1999)

Weather Element	Average
Visibility	12.9 ^km
Wind Direction	WSW (235.8 °)

Weather Element	Total
Heating Degree Days	18.4 (Base 18.3)

Total Years on Record: 22

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