Waltham Massachusetts Climate Data

Monthly Average Climate Data for Waltham Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.2 °F36.3 °F3.75 in.
February19.9 °F38.9 °F3.35 in.
March27.4 °F45.9 °F4.52 in.
April37.7 °F58.3 °F4.15 in.
May47.6 °F68.8 °F3.74 in.
June56.9 °F77.7 °F4.23 in.
July62.8 °F83.5 °F3.61 in.
August61.4 °F82.0 °F3.88 in.
September53.8 °F75.0 °F3.71 in.
October42.4 °F63.0 °F4.77 in.
November33.0 °F52.4 °F3.97 in.
December24.7 °F42.0 °F4.68 in.
Annual40.5 °F60.3 °F48.36 in.

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 : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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