Williamstown Pennsylvania Climate Data

Monthly Average Climate Data for Williamstown Pennsylvania

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.2 °C1.9 °C89.66 mm
February-6.4 °C3.3 °C71.88 mm
March-2.1 °C8.2 °C103.63 mm
April3.8 °C15.7 °C108.46 mm
May9.3 °C21.3 °C110.24 mm
June14.2 °C25.9 °C123.44 mm
July16.3 °C28.5 °C122.68 mm
August15.3 °C27.7 °C116.59 mm
September11.4 °C23.9 °C132.08 mm
October5.3 °C17.3 °C118.36 mm
November0.2 °C10.3 °C97.79 mm
December-3.9 °C4.5 °C100.84 mm
Annual4.7 °C15.7 °C1295.65 mm

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 : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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