Portsmouth Rhode Island Climate Data

Monthly Average Climate Data for Portsmouth Rhode Island

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.3 °C3.3 °C106.68 mm
February-4.8 °C4.4 °C93.98 mm
March-1.3 °C8.1 °C138.94 mm
April4.4 °C13.8 °C118.36 mm
May9.6 °C19.3 °C85.09 mm
June14.9 °C24.2 °C95.25 mm
July18.6 °C27.6 °C80.26 mm
August17.3 °C27 °C88.39 mm
September14.4 °C23.4 °C93.22 mm
October7.8 °C17.1 °C114.3 mm
November3.2 °C11.3 °C102.36 mm
December-2 °C6.3 °C127 mm
Annual6.4 °C15.5 °C1243.83 mm

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 : -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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