Haddam Connecticut Climate Data

Monthly Average Climate Data for Haddam Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January20.2 °F36.7 °F4.06 in.
February21.3 °F39.3 °F3.47 in.
March28.1 °F46.9 °F4.75 in.
April38.0 °F58.7 °F4.59 in.
May47.3 °F68.9 °F3.81 in.
June56.8 °F77.6 °F4.94 in.
July62.3 °F82.8 °F3.91 in.
August61.1 °F81.3 °F4.46 in.
September53.8 °F74.3 °F4.45 in.
October43.0 °F62.8 °F5.33 in.
November33.6 °F52.0 °F4.28 in.
December26.2 °F42.3 °F4.77 in.
Annual41 °F60.3 °F52.82 in.

Climate Data for Haddam Connecticut

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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
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