Williamstown Massachusetts Climate Data

Monthly Average Climate Data for Williamstown Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.2 °C-0.4 °C74.17 mm
February-9.3 °C1.1 °C54.86 mm
March-4.8 °C5.8 °C70.87 mm
April1.4 °C13.4 °C87.12 mm
May7.3 °C19.9 °C88.65 mm
June12.2 °C24.6 °C113.28 mm
July14.8 °C26.9 °C128.27 mm
August13.9 °C25.9 °C108.97 mm
September10 °C22.2 °C110.49 mm
October3.9 °C15.4 °C106.93 mm
November-1.3 °C8.8 °C85.09 mm
December-6.1 °C2.7 °C81.28 mm
Annual2.7 °C13.9 °C1109.98 mm

Climate Data for Williamstown Massachusetts

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
2024 plantmaps.com