Portsmouth Rhode Island Climate Data

Monthly Average Climate Data for Portsmouth Rhode Island

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.5 °F38.0 °F4.2 in.
February23.4 °F40.0 °F3.7 in.
March29.7 °F46.5 °F5.47 in.
April39.9 °F56.8 °F4.66 in.
May49.2 °F66.8 °F3.35 in.
June58.9 °F75.6 °F3.75 in.
July65.4 °F81.7 °F3.16 in.
August63.2 °F80.6 °F3.48 in.
September58.0 °F74.2 °F3.67 in.
October46.0 °F62.8 °F4.5 in.
November37.8 °F52.4 °F4.03 in.
December28.4 °F43.4 °F5.0 in.
Annual43.5 °F59.9 °F48.97 in.

Climate Data for Portsmouth Rhode Island

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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