HERNDON, VIRGINIA

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

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DAILY WEATHER AVERAGE - 17 SEPTEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	18.6 ^°C	24.4 ^°C	13.2 ^°C	31.1 ^°C (2005)	5.6 ^°C (2000)
Dewpoint	13.1 ^°C	15.2 ^°C	11 ^°C	23 ^°C (2004)	1.1 ^°C (2000)
Humidity	73.5 ^%	94.4 ^%	48.6 ^%		29 ^% (2000)
Barometer	1018.3 ^hPa	1021 ^hPa	1015.9 ^hPa	1030.8 ^hPa (2013)	1001.4 ^hPa (2004)
Wind Speed	8.9 ^km/h	19.2 ^km/h		35.2 ^km/h (2004)
Wind Gust		39.6 ^km/h		68.6 ^km/h (2004)
Precipitation	49.53 ^mm			183.39 ^mm (2004)

Weather Element	Average
Visibility	13.7 ^km
Wind Direction	S (184.9 °)

Total Years on Record: 20

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