HERNDON, VIRGINIA

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

WEATHER

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DAILY WEATHER AVERAGE - 18 FEBRUARY

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	2.1 ^°C	7.8 ^°C	-3.4 ^°C	23.3 ^°C (2011)	-16.1 ^°C (2015)
Dewpoint	-5.4 ^°C	-1.7 ^°C	-10.4 ^°C	13.3 ^°C (2008)	-21.7 ^°C (2011)
Humidity	61.9 ^%	81 ^%	37 ^%		13 ^% (2011)
Barometer	1018.3 ^hPa	1023.4 ^hPa	1013.9 ^hPa	1035.2 ^hPa (2016)	997.3 ^hPa (2009)
Wind Speed	15.1 ^km/h	29 ^km/h		48.1 ^km/h (2010)
Wind Gust		45.1 ^km/h		76 ^km/h (2010)
Precipitation	10.41 ^mm			38.1 ^mm (2000)

Weather Element	Average
Visibility	14.3 ^km
Wind Direction	WSW (249.5 °)

Weather Element	Total
Heating Degree Days	16.2 (Base 18.3)
Growing Degree Days	4.5 (Base 10)

Total Years on Record: 22

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