Chehalis Washington Climate Data

Monthly Average Climate Data for Chehalis Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.0 °F46.8 °F6.77 in.
February34.5 °F50.4 °F4.71 in.
March36.4 °F54.9 °F5.22 in.
April39.1 °F60.4 °F3.58 in.
May44.6 °F67.4 °F2.29 in.
June48.7 °F72.0 °F1.72 in.
July52.3 °F78.7 °F0.55 in.
August52.3 °F79.9 °F0.81 in.
September48.1 °F74.2 °F1.68 in.
October42.6 °F62.3 °F4.45 in.
November37.7 °F51.8 °F7.81 in.
December34.5 °F45.7 °F7.52 in.
Annual42.2 °F62 °F47.11 in.

Climate Data for Chehalis 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 : 15°F to 20°F
Plant Hardiness Zone - 2012Zone 8b : 15°F to 20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate