| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5a: -20°F to -15°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 10j - Nez Perce Prairie |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 83530 - Grangeville, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 24 | 27 | 32 | 39 | 45 | 50 | 49 | 41 | 34 | 28 | 22 | 34 |
| Avg Max Temp (°F) | 37 | 42 | 48 | 56 | 63 | 71 | 80 | 82 | 71 | 59 | 44 | 37 | 57 |
| Avg Precip (In.) | 1.52 | 1.33 | 2.38 | 2.86 | 3.61 | 2.82 | 1.62 | 1.21 | 1.6 | 1.78 | 1.88 | 1.57 | 24.18 |