Williamstown Pennsylvania Climate Data

Monthly Average Climate Data for Williamstown Pennsylvania

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.0 °F35.4 °F3.53 in.
February20.5 °F37.9 °F2.83 in.
March28.3 °F46.8 °F4.08 in.
April38.8 °F60.3 °F4.27 in.
May48.7 °F70.4 °F4.34 in.
June57.5 °F78.6 °F4.86 in.
July61.3 °F83.3 °F4.83 in.
August59.6 °F81.8 °F4.59 in.
September52.6 °F75.0 °F5.2 in.
October41.6 °F63.2 °F4.66 in.
November32.3 °F50.5 °F3.85 in.
December24.9 °F40.1 °F3.97 in.
Annual40.4 °F60.3 °F51.01 in.

Climate Data for Williamstown Pennsylvania

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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