| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2i - Cowlitz/Newaukum Prairie Floodplains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98532 - Chehalis, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 39 | 45 | 49 | 52 | 53 | 48 | 42 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 45 | 49 | 55 | 60 | 66 | 72 | 77 | 78 | 73 | 61 | 50 | 45 | 61 |
| Avg Precip (In.) | 6.71 | 5.65 | 5.07 | 3.6 | 2.45 | 1.92 | .86 | 1.14 | 2 | 3.97 | 7.36 | 7.44 | 48.18 |