Lewiston Idaho Climate Data

Monthly Average Climate Data for Lewiston Idaho

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January31.1 °F43.1 °F1.07 in.
February32.1 °F48.4 °F1.22 in.
March35.8 °F56.6 °F1.32 in.
April41.1 °F64.3 °F1.19 in.
May47.7 °F73.5 °F1.37 in.
June53.3 °F80.3 °F0.93 in.
July59.2 °F92.2 °F0.57 in.
August59.0 °F91.9 °F0.48 in.
September51.9 °F81.7 °F0.51 in.
October42.9 °F65.6 °F1.08 in.
November35.5 °F50.5 °F1.12 in.
December30.4 °F41.7 °F0.88 in.
Annual43.3 °F65.8 °F11.74 in.

Climate Data for Lewiston Idaho

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7b : 5°F to 10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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