Groton Massachusetts Climate Data

Monthly Average Climate Data for Groton Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.4 °C1.2 °C90.17 mm
February-8.6 °C2.7 °C85.34 mm
March-4.1 °C7.1 °C108.46 mm
April1.9 °C14.5 °C100.84 mm
May7.9 °C20.7 °C95.5 mm
June13.3 °C25.6 °C114.81 mm
July16.3 °C28.7 °C93.73 mm
August15.3 °C27.8 °C99.82 mm
September10.8 °C23.7 °C102.62 mm
October4.3 °C16.7 °C121.67 mm
November-1 °C10.2 °C98.04 mm
December-5.8 °C4.3 °C113.54 mm
Annual3.4 °C15.3 °C1224.54 mm

Climate Data for Groton Massachusetts

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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