Mill Creek Washington Climate Data

Monthly Average Climate Data for Mill Creek Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.9 °F46.2 °F5.7 in.
February35.9 °F48.6 °F4.37 in.
March38.3 °F52.6 °F4.79 in.
April41.5 °F56.8 °F3.62 in.
May46.7 °F63.6 °F2.68 in.
June50.5 °F67.4 °F2.05 in.
July54.2 °F73.4 °F0.91 in.
August54.7 °F74.3 °F1.12 in.
September51.2 °F69.0 °F2.15 in.
October45.2 °F58.7 °F4.14 in.
November39.1 °F50.5 °F6.77 in.
December35.7 °F45.4 °F5.99 in.
Annual44.1 °F58.9 °F44.29 in.

Climate Data for Mill Creek Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 1 - Apr. 10
Average Days With Frost30-40 Days
Plant Hardiness Zone - 2023Zone 9a : 20°F to 25°F
Plant Hardiness Zone - 2012Zone 8b : 15°F to 20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate