Mattawa Washington Climate Data

Monthly Average Climate Data for Mattawa Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.2 °C4.1 °C27.18 mm
February-1.6 °C8.1 °C17.27 mm
March1.2 °C13.4 °C18.03 mm
April4.3 °C18.1 °C14.73 mm
May8.7 °C23.3 °C14.73 mm
June12.2 °C27.1 °C16.26 mm
July15.7 °C32.3 °C6.86 mm
August15.1 °C31.7 °C3.3 mm
September10.4 °C26.6 °C4.57 mm
October4.7 °C18.2 °C16.76 mm
November-0.1 °C9.4 °C23.37 mm
December-3.1 °C3.9 °C31.75 mm
Annual5.4 °C18 °C194.81 mm

Climate Data for Mattawa Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
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 ClassificationBWk - Cold Desert Climate
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