Williston Maryland Climate Data

Monthly Average Climate Data for Williston Maryland

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January26.0 °F44.1 °F3.39 in.
February27.2 °F46.8 °F2.96 in.
March33.7 °F54.4 °F3.98 in.
April43.7 °F66.2 °F3.64 in.
May53.4 °F75.1 °F3.97 in.
June62.5 °F83.8 °F4.33 in.
July67.3 °F88.2 °F4.35 in.
August65.1 °F86.0 °F4.66 in.
September58.7 °F80.3 °F4.03 in.
October47.2 °F69.3 °F3.96 in.
November36.9 °F58.0 °F3.22 in.
December30.4 °F48.5 °F3.7 in.
Annual46 °F66.7 °F46.19 in.

Climate Data for Williston Maryland

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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