Grafton Massachusetts Climate Data

Monthly Average Climate Data for Grafton Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.7 °C1.6 °C97.28 mm
February-7.9 °C3.1 °C86.36 mm
March-3.6 °C7.3 °C117.35 mm
April2.2 °C14.3 °C111.76 mm
May8.1 °C20.2 °C89.66 mm
June13.2 °C24.7 °C106.68 mm
July16.4 °C27.7 °C96.01 mm
August15.6 °C26.9 °C103.89 mm
September11.2 °C23.2 °C100.33 mm
October4.9 °C16.6 °C124.97 mm
November-0.4 °C10.4 °C98.04 mm
December-5.2 °C4.7 °C120.65 mm
Annual3.8 °C15.1 °C1252.98 mm

Climate Data for Grafton Massachusetts

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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