Viola, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.4 °F (low) to 57.8 °F (high). Annual precipitation averages 25.2 Inches. Viola is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.9 °F | 36.5 °F | 3.5 in. |
| February | 26.7 °F | 40.5 °F | 2.44 in. |
| March | 30.5 °F | 47.8 °F | 2.67 in. |
| April | 35.0 °F | 55.5 °F | 2.3 in. |
| May | 41.0 °F | 64.7 °F | 2.2 in. |
| June | 45.3 °F | 70.6 °F | 1.46 in. |
| July | 48.5 °F | 82.2 °F | 0.49 in. |
| August | 48.7 °F | 83.6 °F | 0.62 in. |
| September | 43.1 °F | 73.9 °F | 0.8 in. |
| October | 36.3 °F | 58.8 °F | 2.11 in. |
| November | 30.6 °F | 44.0 °F | 3.0 in. |
| December | 25.1 °F | 35.4 °F | 3.59 in. |
| Annual | 36.4 °F | 57.8 °F | 25.18 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |