Charlestown Maryland Climate Data

Monthly Average Climate Data for Charlestown Maryland

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4 °C5.5 °C87.12 mm
February-3.5 °C6.9 °C73.41 mm
March0.3 °C11.4 °C108.71 mm
April6.3 °C17.5 °C96.52 mm
May11.6 °C22.9 °C98.81 mm
June16.8 °C27.8 °C117.86 mm
July19.7 °C30.3 °C116.08 mm
August18.8 °C29.4 °C107.44 mm
September15 °C25.8 °C114.81 mm
October8.2 °C19.3 °C106.68 mm
November2.8 °C13.2 °C83.31 mm
December-1.2 °C7.8 °C105.92 mm
Annual7.6 °C18.2 °C1216.67 mm

Climate Data for Charlestown Maryland

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 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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