Portland Oregon Climate Data

Monthly Average Climate Data for Portland Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January36.3 °F47.0 °F6.43 in.
February36.9 °F50.8 °F4.52 in.
March39.3 °F55.9 °F4.64 in.
April42.7 °F61.1 °F3.52 in.
May48.1 °F68.3 °F2.42 in.
June52.4 °F73.1 °F1.64 in.
July56.4 °F80.7 °F0.42 in.
August56.5 °F81.6 °F0.54 in.
September52.2 °F75.8 °F1.49 in.
October45.9 °F64.1 °F3.68 in.
November40.4 °F53.1 °F6.39 in.
December36.2 °F46.5 °F7.4 in.
Annual45.3 °F63.2 °F43.09 in.

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 : 20°F to 25°F
Plant Hardiness Zone - 2012Zone 9a : 20°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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