Portland Connecticut Climate Data

Monthly Average Climate Data for Portland Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-6.8 °C2.4 °C96.01 mm
February-6 °C3.8 °C83.57 mm
March-1.7 °C8.3 °C113.03 mm
April4 °C15.3 °C107.19 mm
May9.5 °C21.2 °C95.5 mm
June14.8 °C26 °C124.21 mm
July17.8 °C29.1 °C105.92 mm
August16.9 °C28.2 °C107.7 mm
September12.8 °C24.1 °C115.06 mm
October6.4 °C17.4 °C133.86 mm
November0.9 °C11.1 °C100.33 mm
December-3.6 °C5.4 °C116.08 mm
Annual5.4 °C16 °C1298.46 mm

Climate Data for Portland Connecticut

Average First Frost DateOct. 11 - Oct. 20
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 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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