| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10b - Loess Islands |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98857 - Warden, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 27 | 32 | 37 | 44 | 50 | 55 | 54 | 46 | 36 | 30 | 24 | 38 |
| Avg Max Temp (°F) | 36 | 44 | 54 | 63 | 71 | 79 | 86 | 86 | 77 | 63 | 46 | 36 | 62 |
| Avg Precip (In.) | 1.01 | .82 | .88 | .65 | .81 | .59 | .4 | .37 | .44 | .69 | 1.16 | 1.24 | 9.05 |