Tri-City Oregon Climate Data

Monthly Average Climate Data for Tri-City Oregon

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January1.3 °C9.7 °C135.64 mm
February1.6 °C12.2 °C96.01 mm
March2.6 °C14.8 °C94.23 mm
April4.2 °C18.1 °C78.49 mm
May6.9 °C22.6 °C55.88 mm
June9.4 °C26.3 °C25.15 mm
July11.9 °C31.2 °C6.86 mm
August11.3 °C31.4 °C8.13 mm
September8.6 °C28.1 °C20.32 mm
October5.3 °C20.8 °C57.4 mm
November3.4 °C12.8 °C124.71 mm
December1.3 °C8.7 °C176.02 mm
Annual5.7 °C19.7 °C878.84 mm

Climate Data for Tri-City Oregon

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost50-75 Days
Plant Hardiness Zone - 2023Zone 8b : -9.4°C to -6.7°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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