Herndon Virginia Climate Data

Monthly Average Climate Data for Herndon Virginia

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January25.1 °F42.6 °F3.05 in.
February26.6 °F45.9 °F2.65 in.
March33.4 °F54.3 °F3.8 in.
April43.6 °F66.0 °F3.36 in.
May53.3 °F74.2 °F4.5 in.
June62.2 °F82.6 °F4.43 in.
July67.1 °F87.2 °F4.31 in.
August65.3 °F85.5 °F3.56 in.
September58.5 °F78.8 °F4.28 in.
October46.2 °F67.3 °F3.83 in.
November36.0 °F56.4 °F3.24 in.
December29.2 °F46.5 °F3.58 in.
Annual45.5 °F65.6 °F44.59 in.

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 : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com