Cornwall Connecticut Climate Data

Monthly Average Climate Data for Cornwall Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.0 °F34.6 °F3.2 in.
February16.6 °F37.8 °F2.56 in.
March24.5 °F45.6 °F3.43 in.
April34.8 °F59.1 °F3.46 in.
May45.0 °F70.4 °F3.67 in.
June54.3 °F78.3 °F4.8 in.
July59.7 °F83.1 °F4.8 in.
August58.0 °F81.2 °F4.14 in.
September50.8 °F73.6 °F4.46 in.
October39.0 °F61.9 °F4.64 in.
November29.4 °F50.3 °F3.26 in.
December21.6 °F39.2 °F3.83 in.
Annual37.4 °F59.6 °F46.25 in.

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 : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year