Lake Oswego Oregon Climate Data

Monthly Average Climate Data for Lake Oswego Oregon

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2.4 °C8.6 °C164.08 mm
February2.7 °C10.7 °C115.06 mm
March3.9 °C13.4 °C127.76 mm
April5.8 °C16.4 °C98.81 mm
May8.8 °C20.4 °C68.33 mm
June11.2 °C23.2 °C42.67 mm
July13.4 °C27.5 °C10.41 mm
August13.5 °C27.8 °C12.95 mm
September11.2 °C24.6 °C42.16 mm
October7.7 °C17.9 °C98.81 mm
November4.6 °C11.7 °C167.64 mm
December2.2 °C8.1 °C171.45 mm
Annual7.3 °C17.5 °C1120.13 mm

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 : -6.7°C to -3.9°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate