Sunnyside Washington Climate Data

Monthly Average Climate Data for Sunnyside Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.3 °C4.3 °C25.65 mm
February-2.6 °C8.4 °C16.76 mm
March-0.1 °C13.6 °C12.95 mm
April2.6 °C17.9 °C13.21 mm
May6.9 °C22.9 °C17.53 mm
June10.1 °C26.5 °C17.27 mm
July12.8 °C31.6 °C4.57 mm
August12.1 °C30.8 °C4.57 mm
September8 °C25.9 °C6.35 mm
October3.1 °C18.1 °C19.56 mm
November-1.1 °C9.7 °C21.34 mm
December-3.6 °C3.8 °C25.65 mm
Annual3.7 °C17.8 °C185.41 mm

Climate Data for Sunnyside 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