Walla Walla Washington Climate Data

Monthly Average Climate Data for Walla Walla Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-1.6 °C5.4 °C49.02 mm
February-0.6 °C8.3 °C38.61 mm
March1.9 °C13.3 °C44.7 mm
April4.5 °C17.3 °C44.45 mm
May8.2 °C22.1 °C46.99 mm
June11.4 °C26.1 °C31.24 mm
July14.6 °C31.9 °C9.14 mm
August14.2 °C31.6 °C11.18 mm
September9.9 °C26.2 °C16.51 mm
October5 °C18 °C36.58 mm
November0.9 °C9.8 °C49.78 mm
December-1.7 °C5 °C53.09 mm
Annual5.6 °C17.9 °C431.29 mm

Climate Data for Walla Walla Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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