Merrimac Massachusetts Climate Data

Monthly Average Climate Data for Merrimac Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.8 °C1.6 °C92.96 mm
February-7.9 °C3.1 °C90.17 mm
March-3.7 °C7.1 °C119.13 mm
April1.9 °C14.1 °C108.71 mm
May7.6 °C19.8 °C99.06 mm
June12.9 °C24.8 °C109.47 mm
July16.1 °C28.1 °C90.68 mm
August15.1 °C27.3 °C88.39 mm
September10.8 °C23.3 °C99.06 mm
October4.4 °C16.6 °C126.24 mm
November-0.5 °C10.4 °C98.55 mm
December-5.2 °C4.6 °C119.63 mm
Annual3.6 °C15.1 °C1242.05 mm

Climate Data for Merrimac Massachusetts

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 21 - May 31
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°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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