Potomac Maryland Climate Data

Monthly Average Climate Data for Potomac Maryland

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January25.8 °F42.7 °F3.08 in.
February27.3 °F46.0 °F2.72 in.
March34.0 °F54.4 °F3.9 in.
April44.1 °F66.3 °F3.38 in.
May53.8 °F74.5 °F4.46 in.
June62.8 °F82.8 °F4.42 in.
July67.6 °F87.2 °F4.29 in.
August65.9 °F85.3 °F3.48 in.
September59.3 °F78.6 °F4.47 in.
October47.2 °F67.1 °F3.81 in.
November36.9 °F56.5 °F3.22 in.
December30.1 °F46.7 °F3.63 in.
Annual46.2 °F65.7 °F44.86 in.

Climate Data for Potomac Maryland

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost75-100 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 ClassificationCfa - Humid Subtropical Climate
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