Alderton Washington Climate Data

Monthly Average Climate Data for Alderton Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January1.7 °C8.6 °C156.72 mm
February1.7 °C10.1 °C98.55 mm
March3 °C12.4 °C115.06 mm
April4.8 °C15.2 °C87.38 mm
May7.9 °C19.2 °C58.42 mm
June10.5 °C21.7 °C51.56 mm
July12.4 °C25.3 °C21.08 mm
August12.4 °C25.6 °C30.73 mm
September10 °C22.3 °C39.88 mm
October6.6 °C16.2 °C110.49 mm
November3.5 °C11.2 °C166.88 mm
December1.4 °C8.1 °C158.24 mm
Annual6.3 °C16.3 °C1094.99 mm

Climate Data for Alderton Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 1 - Apr. 10
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 ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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