| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 52b - Paleozoic Plateau/Coulee Section |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54664 - Viola, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 11 | 23 | 34 | 46 | 55 | 60 | 58 | 49 | 37 | 25 | 12 | 34 |
| Avg Max Temp (°F) | 24 | 31 | 42 | 57 | 69 | 78 | 82 | 79 | 71 | 59 | 42 | 29 | 55 |
| Avg Precip (In.) | 1.04 | 1.09 | 2.03 | 3.49 | 3.67 | 4 | 4.4 | 4.3 | 3.61 | 2.21 | 2.27 | 1.25 | 33.37 |