Lake Oswego Oregon Climate Data

Monthly Average Climate Data for Lake Oswego Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January36.4 °F47.4 °F6.46 in.
February36.8 °F51.2 °F4.53 in.
March39.1 °F56.1 °F5.03 in.
April42.5 °F61.5 °F3.89 in.
May47.9 °F68.7 °F2.69 in.
June52.2 °F73.8 °F1.68 in.
July56.2 °F81.5 °F0.41 in.
August56.3 °F82.1 °F0.51 in.
September52.1 °F76.2 °F1.66 in.
October45.8 °F64.2 °F3.89 in.
November40.2 °F53.1 °F6.6 in.
December36.0 °F46.6 °F6.75 in.
Annual45.1 °F63.5 °F44.1 in.

Climate Data for Lake Oswego Oregon

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateMar. 21 - Mar. 31
Average Days With Frost30-40 Days
Plant Hardiness Zone - 2023Zone 9a : 20°F to 25°F
Plant Hardiness Zone - 2012Zone 8b : 15°F to 20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate