Grafton Massachusetts Climate Data

Monthly Average Climate Data for Grafton Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.3 °F34.8 °F3.83 in.
February17.7 °F37.5 °F3.4 in.
March25.5 °F45.1 °F4.62 in.
April35.9 °F57.7 °F4.4 in.
May46.5 °F68.3 °F3.53 in.
June55.8 °F76.5 °F4.2 in.
July61.6 °F81.9 °F3.78 in.
August60.0 °F80.5 °F4.09 in.
September52.1 °F73.8 °F3.95 in.
October40.8 °F61.8 °F4.92 in.
November31.2 °F50.7 °F3.86 in.
December22.7 °F40.4 °F4.75 in.
Annual38.8 °F59.1 °F49.33 in.

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 : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation