Ontario Oregon Climate Data

Monthly Average Climate Data for Ontario Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.0 °F37.1 °F1.07 in.
February26.5 °F45.8 °F0.76 in.
March32.2 °F57.0 °F0.84 in.
April37.3 °F64.5 °F0.82 in.
May46.0 °F73.9 °F1.22 in.
June52.8 °F82.2 °F0.68 in.
July59.7 °F92.9 °F0.31 in.
August57.1 °F91.5 °F0.11 in.
September47.8 °F81.0 °F0.36 in.
October37.0 °F66.1 °F0.71 in.
November28.6 °F49.5 °F0.99 in.
December23.2 °F38.2 °F1.56 in.
Annual39.3 °F65 °F9.43 in.

Climate Data for Ontario Oregon

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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