| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10h - Palouse Hills |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 83855 - Potlatch, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 28 | 32 | 35 | 40 | 44 | 47 | 46 | 39 | 33 | 29 | 24 | 35 |
| Avg Max Temp (°F) | 37 | 44 | 52 | 57 | 66 | 72 | 81 | 83 | 74 | 60 | 42 | 37 | 59 |
| Avg Precip (In.) | 2.83 | 2.61 | 2.44 | 2.18 | 2.55 | 1.78 | 1.08 | 1.09 | 1.25 | 1.77 | 3.18 | 3.16 | 25.92 |