Records for Portland Area, Maine (PWMthr) on 05-21
Record Highs
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1: 91°F (2009)
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2: 87°F (1992)
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3: 84°F (1996)
Record Lows
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1: 33°F (1976)
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2: 34°F (2002)
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3: 34°F (1944)
Lowest Highs
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1: 56°F (1951)
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2: 55°F (1996)
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3: 55°F (1986)
Highest Lows
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1: 46°F (1990)
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2: 46°F (1948)
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3: 50°F (1943)
Highest May temperature:
94°F on 05-31-1987.
Lowest May temperature:
23°F on 05-09-1956.
Average temperature is 56.3°F
Average high is 65.6°F
Average low is 47.1°F
Temperature data from 1874 to 2022.
Record Precipitation
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1: 1.43" (1889)
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2: 1.40" (1973)
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3: 0.89" (1952)
Precipitation data from 1871 to 2022.