Sammamish Washington Climate Data

Monthly Average Climate Data for Sammamish Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2.4 °C8.6 °C145.03 mm
February2.4 °C10.1 °C107.44 mm
March3.8 °C12.2 °C117.09 mm
April5.8 °C15.2 °C93.73 mm
May8.7 °C18.9 °C60.96 mm
June11.2 °C21.2 °C55.37 mm
July13.1 °C24.9 °C21.59 mm
August13.1 °C25.3 °C26.42 mm
September11.1 °C22.1 °C49.28 mm
October7.6 °C16.1 °C113.79 mm
November4.4 °C11.1 °C163.83 mm
December2.3 °C8.1 °C153.42 mm
Annual7.2 °C16.2 °C1107.95 mm

Climate Data for Sammamish Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost40-50 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