Ontario Oregon Climate Data

Monthly Average Climate Data for Ontario Oregon

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5 °C2.8 °C27.18 mm
February-3.1 °C7.7 °C19.3 mm
March0.1 °C13.9 °C21.34 mm
April2.9 °C18.1 °C20.83 mm
May7.8 °C23.3 °C30.99 mm
June11.6 °C27.9 °C17.27 mm
July15.4 °C33.8 °C7.87 mm
August13.9 °C33.1 °C2.79 mm
September8.8 °C27.2 °C9.14 mm
October2.8 °C18.9 °C18.03 mm
November-1.9 °C9.7 °C25.15 mm
December-4.9 °C3.4 °C39.62 mm
Annual4 °C18.3 °C239.51 mm

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 : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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