South Portland Maine Climate Data

Monthly Average Climate Data for South Portland Maine

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.6 °C0.1 °C89.15 mm
February-7.6 °C1.4 °C89.15 mm
March-3.1 °C5.1 °C102.62 mm
April2.6 °C11.3 °C108.2 mm
May8.1 °C17.1 °C91.95 mm
June13.4 °C22.4 °C107.95 mm
July16.4 °C25.4 °C86.11 mm
August16.4 °C25.3 °C84.33 mm
September12.2 °C21.4 °C103.12 mm
October6.2 °C15 °C117.35 mm
November0.8 °C8.9 °C106.17 mm
December-4.6 °C3.5 °C114.81 mm
Annual4.4 °C13.1 °C1200.91 mm

Climate Data for South Portland Maine

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 21 - May 31
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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