Onset Massachusetts Climate Data

Monthly Average Climate Data for Onset Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.2 °C3.8 °C107.44 mm
February-4.8 °C4.4 °C92.96 mm
March-1.6 °C7.7 °C137.41 mm
April3.5 °C13 °C113.79 mm
May8.9 °C18.7 °C92.71 mm
June14.3 °C23.7 °C95.5 mm
July18.1 °C27.1 °C80.26 mm
August17.4 °C26.4 °C91.69 mm
September13.5 °C22.9 °C110.24 mm
October7.7 °C17.1 °C124.97 mm
November2.7 °C11.8 °C110.49 mm
December-1.8 °C6.9 °C130.81 mm
Annual6.1 °C15.3 °C1288.27 mm

Climate Data for Onset Massachusetts

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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