DULLES, VIRGINIA

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Elevation: 88 meters Latitude: 38 57N Longitude: 077 27W

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DAILY WEATHER AVERAGE - 21 JANUARY

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	-1.6 ^°C	2.3 ^°C	-6.1 ^°C	16.7 ^°C (2006)	-13.9 ^°C (2008)
Dewpoint	-8.3 ^°C	-4.4 ^°C	-11.8 ^°C	8.9 ^°C (2006)	-20.6 ^°C (2005)
Humidity	63.7 ^%	81.4 ^%	46.1 ^%		25 ^% (2005)
Barometer	1020.3 ^hPa	1024.7 ^hPa	1015.6 ^hPa	1044.7 ^hPa (2008)	996.3 ^hPa (1995)
Wind Speed	12.2 ^km/h	23.7 ^km/h		40.7 ^km/h (2011)
Wind Gust		43.8 ^km/h		61.2 ^km/h (2011)
Precipitation	6.6 ^mm			14.48 ^mm (1999)

Weather Element	Average
Visibility	14.2 ^km
Wind Direction	SW (219.8 °)

Weather Element	Total
Heating Degree Days	20.2 (Base 18.3)

Total Years on Record: 22

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