Castle Rock Washington Climate Data

Monthly Average Climate Data for Castle Rock Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2 °C8.2 °C166.88 mm
February1.6 °C10.3 °C119.38 mm
March3.1 °C12.7 °C125.98 mm
April4.8 °C15.4 °C104.39 mm
May7.8 °C19.2 °C71.37 mm
June10.1 °C21.4 °C49.78 mm
July12.1 °C25 °C14.48 mm
August12.1 °C25.8 °C21.59 mm
September9.9 °C23.2 °C46.99 mm
October6.6 °C17 °C112.52 mm
November3.8 °C11.1 °C182.88 mm
December1.7 °C7.6 °C185.93 mm
Annual6.3 °C16.4 °C1202.17 mm

Climate Data for Castle Rock Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost50-75 Days
Plant Hardiness Zone - 2023Zone 8b : -9.4°C to -6.7°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate