Viola, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 20 °C (high). Annual precipitation averages 864.9 Millimeters. Viola is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 6.1 °C | 22.35 mm |
| February | -3.5 °C | 8.7 °C | 33.53 mm |
| March | 1.5 °C | 14.3 °C | 61.21 mm |
| April | 6.7 °C | 19.5 °C | 79.5 mm |
| May | 12.9 °C | 24.7 °C | 128.78 mm |
| June | 18.5 °C | 30.7 °C | 126.75 mm |
| July | 20.9 °C | 33.3 °C | 98.81 mm |
| August | 19.9 °C | 32.3 °C | 98.81 mm |
| September | 15.3 °C | 28.1 °C | 69.09 mm |
| October | 8.4 °C | 21.5 °C | 74.93 mm |
| November | 1.6 °C | 13.8 °C | 39.12 mm |
| December | -3.7 °C | 7.3 °C | 32 mm |
| Annual | 7.8 °C | 20 °C | 864.88 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |