Hermiston Oregon Climate Data

Monthly Average Climate Data for Hermiston Oregon

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-1.9 °C5.5 °C30.73 mm
February-1.5 °C8.8 °C22.86 mm
March1 °C14.1 °C20.83 mm
April4.1 °C18.3 °C19.05 mm
May8.2 °C23.3 °C22.61 mm
June11.6 °C27 °C14.73 mm
July14.8 °C32.3 °C3.56 mm
August14.3 °C31.8 °C5.33 mm
September9.8 °C26.7 °C7.87 mm
October4.5 °C18.6 °C20.57 mm
November0.4 °C10.3 °C26.42 mm
December-1.9 °C5.2 °C30.73 mm
Annual5.3 °C18.5 °C225.29 mm

Climate Data for Hermiston Oregon

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 : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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