Winthrop Washington Climate Data

Monthly Average Climate Data for Winthrop Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.6 °C-0.6 °C51.82 mm
February-7.1 °C3.7 °C30.99 mm
March-3.3 °C9.7 °C31.24 mm
April0.4 °C15.9 °C21.84 mm
May4.6 °C21.4 °C27.18 mm
June8.1 °C24.8 °C27.94 mm
July10.9 °C30 °C16.51 mm
August10.3 °C30.1 °C11.94 mm
September6 °C24.9 °C10.92 mm
October0.7 °C15.8 °C30.99 mm
November-3.7 °C5.4 °C50.8 mm
December-8.5 °C-1.2 °C60.71 mm
Annual0.8 °C15 °C372.88 mm

Climate Data for Winthrop Washington

Average First Frost DateSep.11 - Sep. 20
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDsb - Humid Continental Climate - Dry Cool Summer