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United States of America

HERNDON, VIRGINIA


Home > North America > United States > Virginia
Elevation: 322 feet     Latitude: 38 57N     Longitude: 077 27W

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DAILY WEATHER AVERAGE - OCTOBER 18
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[ °C ]   °F
Weather ElementAvgAvg HighAvg LowRecord HighRecord Low
Temperature 54.9 °F 66 °F 43.9 °F 80.1 °F (2007) 32 °F (2004)
Dewpoint 44 °F 49.8 °F 38.8 °F 66.9 °F (2007) 23 °F (2005)
Humidity 70.2 % 93.1 % 43.4 % 25 % (2005)
Barometer 30.04 in 30.13 in 29.95 in 30.45 in (2015) 29.63 in (1996)
Wind Speed 6.8 mph 14 mph 24.2 mph (1996)
Wind Gust 24.9 mph 43.7 mph (1996)
Precipitation 0.79 in 1.61 in (1996)
Weather ElementAverage
Visibility9.3 mi
Wind DirectionSSW (215.4 °)
Weather ElementTotal
Heating Degree Days11.6 (Base 18.3)
Cooling Degree Days3.8 (Base 18.3)
Growing Degree Days8.6 (Base 10)
Total Years on Record: 20
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