Waltham Massachusetts Climate Data

Monthly Average Climate Data for Waltham Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.7 °C2.4 °C95.25 mm
February-6.7 °C3.8 °C85.09 mm
March-2.6 °C7.7 °C114.81 mm
April3.2 °C14.6 °C105.41 mm
May8.7 °C20.4 °C95 mm
June13.8 °C25.4 °C107.44 mm
July17.1 °C28.6 °C91.69 mm
August16.3 °C27.8 °C98.55 mm
September12.1 °C23.9 °C94.23 mm
October5.8 °C17.2 °C121.16 mm
November0.6 °C11.3 °C100.84 mm
December-4.1 °C5.6 °C118.87 mm
Annual4.7 °C15.7 °C1228.34 mm

Climate Data for Waltham 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 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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