Norwalk Connecticut Climate Data

Monthly Average Climate Data for Norwalk Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.9 °C3.8 °C100.84 mm
February-4.2 °C4.8 °C73.91 mm
March-0.5 °C8.8 °C104.65 mm
April5.1 °C15.2 °C99.57 mm
May10.3 °C20.8 °C94.23 mm
June15.7 °C25.7 °C126.75 mm
July18.9 °C28.7 °C93.47 mm
August18.4 °C27.9 °C106.17 mm
September14.4 °C24.5 °C119.63 mm
October8.4 °C18.1 °C110.49 mm
November3 °C12.1 °C101.6 mm
December-1.4 °C6.8 °C116.08 mm
Annual6.9 °C16.4 °C1247.39 mm

Climate Data for Norwalk Connecticut

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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