Records for Boise Area, Idaho (BOIthr) on 05-21
Record Highs
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1: 91°F (1919)
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2: 90°F (1980)
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3: 90°F (1967)
Record Lows
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1: 27°F (1887)
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2: 31°F (1918)
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3: 33°F (1974)
Lowest Highs
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1: 63°F (2012)
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2: 62°F (1980)
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3: 59°F (1958)
Highest Lows
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1: 52°F (1960)
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2: 53°F (1927)
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3: 53°F (1905)
Highest May temperature:
100°F on 05-29-1897.
Lowest May temperature:
22°F on 05-05-1982.
Average temperature is 61.5°F
Average high is 73.9°F
Average low is 49°F
Temperature data from 1875 to 2022.
Record Precipitation
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1: 1.12" (1932)
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2: 0.80" (1998)
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3: 0.67" (2019)
Precipitation data from 1878 to 2022.