Chelsea Massachusetts Climate Data

Monthly Average Climate Data for Chelsea Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.8 °C2.8 °C103.38 mm
February-4.9 °C4 °C94.49 mm
March-1.2 °C7.4 °C125.22 mm
April4.4 °C13.7 °C111 mm
May9.7 °C19.3 °C88.65 mm
June15.2 °C24.6 °C103.63 mm
July18.5 °C27.8 °C90.93 mm
August17.9 °C26.9 °C90.42 mm
September14 °C22.9 °C93.22 mm
October7.8 °C16.8 °C124.71 mm
November2.6 °C11.1 °C104.9 mm
December-2.3 °C5.8 °C125.22 mm
Annual6.3 °C15.3 °C1255.77 mm

Climate Data for Chelsea Massachusetts

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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