Southwest Harbor Maine Climate Data

Monthly Average Climate Data for Southwest Harbor Maine

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.3 °C-0.4 °C116.84 mm
February-8.6 °C0.5 °C97.79 mm
March-4.2 °C4.2 °C120.4 mm
April1.3 °C10 °C114.55 mm
May6.4 °C15.7 °C111 mm
June11.1 °C20.9 °C106.68 mm
July14.4 °C24.1 °C82.3 mm
August14.3 °C23.9 °C76.45 mm
September10.9 °C20.1 °C104.14 mm
October5.4 °C13.9 °C144.02 mm
November0.2 °C8.3 °C140.46 mm
December-5.6 °C2.9 °C140.97 mm
Annual3 °C12 °C1355.6 mm

Climate Data for Southwest Harbor Maine

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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