Prosser Washington Climate Data

Monthly Average Climate Data for Prosser Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January26.6 °F40.2 °F1.23 in.
February27.4 °F47.6 °F0.87 in.
March31.9 °F57.0 °F0.72 in.
April37.0 °F65.0 °F0.76 in.
May45.4 °F74.4 °F0.67 in.
June51.2 °F81.2 °F0.68 in.
July55.5 °F90.3 °F0.42 in.
August54.6 °F89.2 °F0.22 in.
September47.1 °F79.8 °F0.3 in.
October38.2 °F65.4 °F0.86 in.
November30.3 °F50.1 °F0.94 in.
December26.1 °F40.1 °F1.21 in.
Annual39.3 °F65 °F8.88 in.

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 : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate