Sumner Washington Climate Data

Monthly Average Climate Data for Sumner Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January1.9 °C8.7 °C156.72 mm
February1.8 °C10.2 °C88.9 mm
March3.2 °C12.6 °C105.41 mm
April5.1 °C15.4 °C77.22 mm
May8.2 °C19.3 °C54.86 mm
June10.8 °C21.8 °C49.53 mm
July12.6 °C25.4 °C19.05 mm
August12.7 °C25.6 °C34.54 mm
September10.2 °C22.3 °C36.83 mm
October6.8 °C16.3 °C108.46 mm
November3.7 °C11.3 °C163.83 mm
December1.6 °C8.2 °C160.02 mm
Annual6.6 °C16.4 °C1055.37 mm

Climate Data for Sumner 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 8b : -9.4°C to -6.7°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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