Portland Oregon Climate Data

Monthly Average Climate Data for Portland Oregon

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2.4 °C8.3 °C163.32 mm
February2.7 °C10.4 °C114.81 mm
March4.1 °C13.3 °C117.86 mm
April5.9 °C16.2 °C89.41 mm
May8.9 °C20.2 °C61.47 mm
June11.3 °C22.8 °C41.66 mm
July13.6 °C27.1 °C10.67 mm
August13.6 °C27.6 °C13.72 mm
September11.2 °C24.3 °C37.85 mm
October7.7 °C17.8 °C93.47 mm
November4.7 °C11.7 °C162.31 mm
December2.3 °C8.1 °C187.96 mm
Annual7.4 °C17.3 °C1094.51 mm

Climate Data for Portland Oregon

Average First Frost DateNov. 21 - Nov. 30
Average Last Frost DateMar. 11 - Mar. 20
Average Days With Frost20-30 Days
Plant Hardiness Zone - 2023Zone 9a : -6.7°C to -3.9°C
Plant Hardiness Zone - 2012Zone 9a : -6.7°C to -3.9°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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