Haddam Connecticut Climate Data

Monthly Average Climate Data for Haddam Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-6.6 °C2.6 °C103.12 mm
February-5.9 °C4.1 °C88.14 mm
March-2.2 °C8.3 °C120.65 mm
April3.3 °C14.8 °C116.59 mm
May8.5 °C20.5 °C96.77 mm
June13.8 °C25.3 °C125.48 mm
July16.8 °C28.2 °C99.31 mm
August16.2 °C27.4 °C113.28 mm
September12.1 °C23.5 °C113.03 mm
October6.1 °C17.1 °C135.38 mm
November0.9 °C11.1 °C108.71 mm
December-3.2 °C5.7 °C121.16 mm
Annual5 °C15.7 °C1341.62 mm

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 : -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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