Records for Hillsboro Area, Oregon (HIOthr) on 05-20
Record Highs
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1: 92°F (1963)
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2: 87°F (1961)
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3: 86°F (1978)
Record Lows
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1: 30°F (1975)
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2: 34°F (2021)
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3: 34°F (1943)
Lowest Highs
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1: 57°F (1972)
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2: 56°F (1942)
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3: 54°F (1993)
Highest Lows
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1: 55°F (2007)
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2: 56°F (1991)
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3: 56°F (1960)
Highest May temperature:
100°F on 05-29-1983.
Lowest May temperature:
26°F on 05-08-1935.
Average temperature is 57.7°F
Average high is 69.7°F
Average low is 45.7°F
Temperature data from 1929 to 2022.
Record Precipitation
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1: 0.63" (1998)
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2: 0.62" (1994)
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3: 0.44" (1930)
Precipitation data from 1929 to 2022.