Cornwall Connecticut Climate Data

Monthly Average Climate Data for Cornwall Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.4 °C1.4 °C81.28 mm
February-8.6 °C3.2 °C65.02 mm
March-4.2 °C7.6 °C87.12 mm
April1.6 °C15.1 °C87.88 mm
May7.2 °C21.3 °C93.22 mm
June12.4 °C25.7 °C121.92 mm
July15.4 °C28.4 °C121.92 mm
August14.4 °C27.3 °C105.16 mm
September10.4 °C23.1 °C113.28 mm
October3.9 °C16.6 °C117.86 mm
November-1.4 °C10.2 °C82.8 mm
December-5.8 °C4 °C97.28 mm
Annual3 °C15.3 °C1174.74 mm

Climate Data for Cornwall Connecticut

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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