Petersham Massachusetts Climate Data

Monthly Average Climate Data for Petersham Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.6 °C-0.5 °C92.46 mm
February-9.7 °C1.2 °C80.52 mm
March-5.4 °C5.4 °C103.63 mm
April0.9 °C12.7 °C96.27 mm
May6.4 °C18.9 °C91.44 mm
June11.9 °C23.8 °C116.33 mm
July15.1 °C26.9 °C103.63 mm
August13.4 °C26 °C111 mm
September9.4 °C21.7 °C105.41 mm
October3.8 °C14.6 °C121.16 mm
November-1.4 °C8.3 °C94.49 mm
December-6.6 °C2.4 °C103.12 mm
Annual2.3 °C13.5 °C1219.46 mm

Climate Data for Petersham Massachusetts

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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