Prosser Washington Climate Data

Monthly Average Climate Data for Prosser Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3 °C4.6 °C31.24 mm
February-2.6 °C8.7 °C22.1 mm
March-0.1 °C13.9 °C18.29 mm
April2.8 °C18.3 °C19.3 mm
May7.4 °C23.6 °C17.02 mm
June10.7 °C27.3 °C17.27 mm
July13.1 °C32.4 °C10.67 mm
August12.6 °C31.8 °C5.59 mm
September8.4 °C26.6 °C7.62 mm
October3.4 °C18.6 °C21.84 mm
November-0.9 °C10.1 °C23.88 mm
December-3.3 °C4.5 °C30.73 mm
Annual4 °C18.4 °C225.55 mm

Climate Data for Prosser Washington

Average First Frost DateOct. 11 - Oct. 20
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 7a : -17.8°C to -15°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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