Union Washington Climate Data

Monthly Average Climate Data for Union Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January1.9 °C8.2 °C290.58 mm
February1.7 °C9.7 °C184.66 mm
March2.8 °C12.2 °C199.14 mm
April4.5 °C15.1 °C125.98 mm
May7.6 °C19.1 °C66.55 mm
June9.9 °C21.2 °C43.43 mm
July11.9 °C24.6 °C17.27 mm
August11.9 °C25.1 °C30.99 mm
September9.7 °C21.9 °C60.45 mm
October6.4 °C15.6 °C177.8 mm
November3.4 °C10.6 °C300.48 mm
December1.7 °C7.6 °C310.13 mm
Annual6.1 °C15.9 °C1807.46 mm

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 : -6.7°C to -3.9°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
2024 plantmaps.com