Williamstown Massachusetts Climate Data

Monthly Average Climate Data for Williamstown Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.6 °F31.3 °F2.92 in.
February15.3 °F34.0 °F2.16 in.
March23.4 °F42.5 °F2.79 in.
April34.6 °F56.2 °F3.43 in.
May45.2 °F67.9 °F3.49 in.
June54.0 °F76.2 °F4.46 in.
July58.7 °F80.4 °F5.05 in.
August57.0 °F78.7 °F4.29 in.
September50.0 °F71.9 °F4.35 in.
October39.0 °F59.8 °F4.21 in.
November29.7 °F47.8 °F3.35 in.
December21.0 °F36.9 °F3.2 in.
Annual36.8 °F57 °F43.7 in.

Climate Data for Williamstown Massachusetts

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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