Seattle Washington Climate Data

Monthly Average Climate Data for Seattle Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2.6 °C8.4 °C136.4 mm
February2.7 °C9.8 °C93.73 mm
March3.8 °C12 °C105.41 mm
April5.7 °C14.8 °C76.45 mm
May8.6 °C18.6 °C50.8 mm
June11 °C20.9 °C42.42 mm
July12.9 °C24.3 °C19.56 mm
August13.1 °C24.7 °C23.88 mm
September11.1 °C21.6 °C40.64 mm
October7.8 °C15.7 °C96.77 mm
November4.6 °C10.8 °C148.84 mm
December2.4 °C7.9 °C148.08 mm
Annual7.2 °C15.8 °C982.98 mm

Climate Data for Seattle Washington

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateApr. 1 - Apr. 10
Average Days With Frost20-30 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 ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate