Marlborough Connecticut Climate Data

Monthly Average Climate Data for Marlborough Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.4 °C2.4 °C95.25 mm
February-6.7 °C3.8 °C82.55 mm
March-2.5 °C8.2 °C114.05 mm
April3.1 °C14.9 °C109.73 mm
May8.5 °C20.7 °C94.49 mm
June13.7 °C25.3 °C112.01 mm
July16.8 °C28.2 °C102.11 mm
August16 °C27.4 °C108.97 mm
September11.8 °C23.6 °C114.3 mm
October5.5 °C17.2 °C126.24 mm
November0.2 °C11 °C100.84 mm
December-4.1 °C5.5 °C115.82 mm
Annual4.6 °C15.7 °C1276.36 mm

Climate Data for Marlborough Connecticut

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 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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