Colchester Connecticut Climate Data

Monthly Average Climate Data for Colchester Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.8 °F36.3 °F3.92 in.
February19.9 °F38.8 °F3.36 in.
March27.3 °F46.5 °F4.64 in.
April37.0 °F58.7 °F4.52 in.
May46.7 °F68.8 °F3.7 in.
June56.2 °F77.2 °F4.27 in.
July61.9 °F82.4 °F3.87 in.
August60.4 °F81.1 °F4.33 in.
September52.7 °F74.3 °F4.58 in.
October41.7 °F62.8 °F4.95 in.
November32.2 °F51.7 °F4.1 in.
December24.8 °F41.9 °F4.7 in.
Annual40 °F60 °F50.94 in.

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 : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year