Herndon Virginia Climate Data

Monthly Average Climate Data for Herndon Virginia

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.8 °C5.9 °C77.47 mm
February-3 °C7.7 °C67.31 mm
March0.8 °C12.4 °C96.52 mm
April6.4 °C18.9 °C85.34 mm
May11.8 °C23.4 °C114.3 mm
June16.8 °C28.1 °C112.52 mm
July19.5 °C30.7 °C109.47 mm
August18.5 °C29.7 °C90.42 mm
September14.7 °C26 °C108.71 mm
October7.9 °C19.6 °C97.28 mm
November2.2 °C13.6 °C82.3 mm
December-1.6 °C8.1 °C90.93 mm
Annual7.5 °C18.7 °C1132.57 mm

Climate Data for Herndon Virginia

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7b : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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