| 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 6a: -10F to -5F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| 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: | Rare Over 86°F |
Annual Climate Data for ZIP Code 83872 - Viola, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 28 | 32 | 36 | 41 | 45 | 48 | 48 | 42 | 35 | 30 | 25 | 36 |
| Avg Max Temp (°F) | 36 | 44 | 52 | 57 | 66 | 72 | 82 | 83 | 74 | 60 | 42 | 36 | 59 |
| Avg Precip (In.) | 2.88 | 2.46 | 2.38 | 2.11 | 2.26 | 1.71 | 1.02 | 1.02 | 1.15 | 1.8 | 3.25 | 3.13 | 25.16 |