Coulee Dam Washington Climate Data

Monthly Average Climate Data for Coulee Dam Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.6 °C2 °C27.94 mm
February-2.7 °C5.6 °C18.03 mm
March0.1 °C11.7 °C22.86 mm
April3.2 °C17.2 °C21.59 mm
May7.5 °C22.7 °C25.91 mm
June11.2 °C26.5 °C23.11 mm
July14.9 °C32.2 °C11.68 mm
August14.7 °C31.9 °C7.37 mm
September10.2 °C26.4 °C6.86 mm
October4.8 °C17.4 °C18.03 mm
November0.3 °C8 °C25.91 mm
December-3 °C2.3 °C31.5 mm
Annual4.8 °C17 °C240.79 mm

Climate Data for Coulee Dam Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7b : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDsb - Humid Continental Climate - Dry Cool Summer