Colchester Connecticut Climate Data

Monthly Average Climate Data for Colchester Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.3 °C2.4 °C99.57 mm
February-6.7 °C3.8 °C85.34 mm
March-2.6 °C8.1 °C117.86 mm
April2.8 °C14.8 °C114.81 mm
May8.2 °C20.4 °C93.98 mm
June13.4 °C25.1 °C108.46 mm
July16.6 °C28 °C98.3 mm
August15.8 °C27.3 °C109.98 mm
September11.5 °C23.5 °C116.33 mm
October5.4 °C17.1 °C125.73 mm
November0.1 °C10.9 °C104.14 mm
December-4 °C5.5 °C119.38 mm
Annual4.4 °C15.6 °C1293.88 mm

Climate Data for Colchester 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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