Union Washington Climate Data

Monthly Average Climate Data for Union Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.5 °F46.7 °F11.44 in.
February35.1 °F49.4 °F7.27 in.
March37.1 °F53.9 °F7.84 in.
April40.1 °F59.1 °F4.96 in.
May45.6 °F66.3 °F2.62 in.
June49.8 °F70.1 °F1.71 in.
July53.4 °F76.3 °F0.68 in.
August53.4 °F77.1 °F1.22 in.
September49.5 °F71.5 °F2.38 in.
October43.6 °F60.0 °F7.0 in.
November38.2 °F51.1 °F11.83 in.
December35.0 °F45.7 °F12.21 in.
Annual43 °F60.6 °F71.16 in.

Climate Data for Union Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost50-75 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
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