Dedham Massachusetts Climate Data

Monthly Average Climate Data for Dedham Massachusetts

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.8 °F36.9 °F4.02 in.
February20.3 °F39.3 °F3.52 in.
March27.8 °F46.3 °F4.88 in.
April37.9 °F58.2 °F4.41 in.
May47.5 °F68.8 °F3.67 in.
June56.9 °F77.6 °F4.17 in.
July62.9 °F83.4 °F3.68 in.
August61.3 °F81.9 °F3.84 in.
September54.0 °F74.9 °F3.84 in.
October42.6 °F63.0 °F4.92 in.
November33.4 °F52.4 °F4.14 in.
December25.0 °F42.4 °F4.9 in.
Annual40.7 °F60.4 °F49.99 in.

Climate Data for Dedham Massachusetts

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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