DULLES, VIRGINIA

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Elevation: 290 feet Latitude: 38 57N Longitude: 077 27W

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DAILY WEATHER AVERAGE - JANUARY 31

[ °C ] °F

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	33.6 ^°F	42.6 ^°F	25.3 ^°F	64.9 ^°F (2012)	10.9 ^°F (2004)
Dewpoint	19.2 ^°F	26.2 ^°F	14.4 ^°F	55.9 ^°F (2013)	-4 ^°F (2014)
Humidity	58.5 ^%	79.5 ^%	41 ^%		20 ^% (2008)
Barometer	30.11 ⁱⁿ	30.23 ⁱⁿ	29.97 ⁱⁿ	30.81 ⁱⁿ (1999)	29.16 ⁱⁿ (2013)
Wind Speed	8 ^mph	15.9 ^mph		32.2 ^mph (2013)
Wind Gust		27.8 ^mph		46 ^mph (2013)
Precipitation	0.15 ⁱⁿ			0.32 ⁱⁿ (2013)

Weather Element	Average
Visibility	9.9 ^mi
Wind Direction	SW (220.9 °)

Weather Element	Total
Heating Degree Days	31.1 (Base 18.3)
Growing Degree Days	0.2 (Base 10)

Total Years on Record: 22

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