Wellesley Massachusetts Climate Data

Monthly Average Climate Data for Wellesley Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.9 °C2.3 °C95.25 mm
February-6.9 °C3.8 °C82.8 mm
March-2.8 °C7.8 °C112.52 mm
April2.8 °C14.7 °C106.17 mm
May8.3 °C20.5 °C93.73 mm
June13.5 °C25.3 °C107.19 mm
July16.8 °C28.6 °C91.44 mm
August15.9 °C27.8 °C98.55 mm
September11.7 °C24 °C97.03 mm
October5.4 °C17.2 °C121.67 mm
November0.3 °C11.2 °C100.58 mm
December-4.4 °C5.4 °C117.35 mm
Annual4.4 °C15.7 °C1224.28 mm

Climate Data for Wellesley 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 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 ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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