Onset Massachusetts Climate Data

Monthly Average Climate Data for Onset Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.6 °F38.8 °F4.23 in.
February23.4 °F39.9 °F3.66 in.
March29.1 °F45.9 °F5.41 in.
April38.3 °F55.4 °F4.48 in.
May48.1 °F65.6 °F3.65 in.
June57.7 °F74.6 °F3.76 in.
July64.5 °F80.7 °F3.16 in.
August63.3 °F79.6 °F3.61 in.
September56.3 °F73.3 °F4.34 in.
October45.9 °F62.7 °F4.92 in.
November36.9 °F53.2 °F4.35 in.
December28.7 °F44.4 °F5.15 in.
Annual42.9 °F59.5 °F50.72 in.

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 : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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