HERNDON, VIRGINIA

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

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DAILY WEATHER AVERAGE - 19 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	2.3 ^°C	6.6 ^°C	-2.4 ^°C	16.1 ^°C (1997)	-8.3 ^°C (2004)
Dewpoint	-3.3 ^°C	-0.6 ^°C	-7.2 ^°C	9.4 ^°C (2002)	-20 ^°C (2013)
Humidity	69.3 ^%	86.7 ^%	51.5 ^%		28 ^% (1997)
Barometer	1017.6 ^hPa	1022 ^hPa	1013.9 ^hPa	1031.5 ^hPa (2006)	1000 ^hPa (1995)
Wind Speed	12.6 ^km/h	24.3 ^km/h		42.6 ^km/h (2004)
Wind Gust		37.8 ^km/h		59.2 ^km/h (2004)
Precipitation	7.37 ^mm			21.59 ^mm (2009)

Weather Element	Average
Visibility	12.9 ^km
Wind Direction	SW (222.1 °)

Weather Element	Total
Heating Degree Days	16.2 (Base 18.3)

Total Years on Record: 21

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