Antietam Maryland Climate Data

Monthly Average Climate Data for Antietam Maryland

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.4 °C5.3 °C77.22 mm
February-4.6 °C7.3 °C61.47 mm
March-0.9 °C12.2 °C91.95 mm
April5.1 °C19.1 °C87.88 mm
May10.7 °C23.9 °C111.76 mm
June15.3 °C28.6 °C99.31 mm
July17.9 °C31.1 °C102.62 mm
August17 °C30.1 °C84.58 mm
September13.1 °C26.4 °C109.73 mm
October5.9 °C20.1 °C87.63 mm
November0.7 °C13.4 °C78.74 mm
December-2.8 °C7.4 °C87.38 mm
Annual6 °C18.7 °C1080.27 mm

Climate Data for Antietam Maryland

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation