DULLES, VIRGINIA

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

WEATHER

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DAILY WEATHER AVERAGE - 23 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	4.3 ^°C	9.4 ^°C	-1.1 ^°C	17.8 ^°C (2015)	-11.1 ^°C (2000)
Dewpoint	-1.2 ^°C	2.8 ^°C	-5.6 ^°C	17.2 ^°C (2015)	-18.3 ^°C (2005)
Humidity	70.7 ^%	89.7 ^%	47.8 ^%		23 ^% (2005)
Barometer	1019.6 ^hPa	1024 ^hPa	1015.6 ^hPa	1040.3 ^hPa (2008)	1002.7 ^hPa (2004)
Wind Speed	11.6 ^km/h	25.3 ^km/h		48.1 ^km/h (2010)
Wind Gust		42.2 ^km/h		72.3 ^km/h (2010)
Precipitation	21.08 ^mm			79.5 ^mm (2004)

Weather Element	Average
Visibility	13 ^km
Wind Direction	SW (222.1 °)

Weather Element	Total
Heating Degree Days	14.2 (Base 18.3)
Growing Degree Days	2.2 (Base 10)

Total Years on Record: 21

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