Hermiston Oregon Climate Data

Monthly Average Climate Data for Hermiston Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January28.5 °F41.9 °F1.21 in.
February29.3 °F47.9 °F0.9 in.
March33.8 °F57.3 °F0.82 in.
April39.4 °F64.9 °F0.75 in.
May46.8 °F73.9 °F0.89 in.
June52.9 °F80.6 °F0.58 in.
July58.7 °F90.2 °F0.14 in.
August57.7 °F89.3 °F0.21 in.
September49.6 °F80.0 °F0.31 in.
October40.1 °F65.4 °F0.81 in.
November32.8 °F50.6 °F1.04 in.
December28.5 °F41.3 °F1.21 in.
Annual41.5 °F65.3 °F8.87 in.

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 : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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