Petersham Massachusetts Climate Data

Monthly Average Climate Data for Petersham Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.0 °F31.1 °F3.64 in.
February14.5 °F34.1 °F3.17 in.
March22.2 °F41.7 °F4.08 in.
April33.6 °F54.9 °F3.79 in.
May43.6 °F66.1 °F3.6 in.
June53.5 °F74.9 °F4.58 in.
July59.2 °F80.5 °F4.08 in.
August56.1 °F78.8 °F4.37 in.
September48.9 °F71.0 °F4.15 in.
October38.8 °F58.3 °F4.77 in.
November29.5 °F46.9 °F3.72 in.
December20.2 °F36.4 °F4.06 in.
Annual36.1 °F56.2 °F48.01 in.

Climate Data for Petersham Massachusetts

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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