Portland Connecticut Climate Data

Monthly Average Climate Data for Portland Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.8 °F36.3 °F3.78 in.
February21.2 °F38.9 °F3.29 in.
March29.0 °F46.9 °F4.45 in.
April39.2 °F59.5 °F4.22 in.
May49.1 °F70.2 °F3.76 in.
June58.6 °F78.8 °F4.89 in.
July64.1 °F84.4 °F4.17 in.
August62.5 °F82.7 °F4.24 in.
September55.1 °F75.4 °F4.53 in.
October43.5 °F63.3 °F5.27 in.
November33.7 °F51.9 °F3.95 in.
December25.5 °F41.7 °F4.57 in.
Annual41.8 °F60.8 °F51.12 in.

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 : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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