| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 51b - Central Wisconsin Undulating Till Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54720 - Altoona, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 8 | 21 | 33 | 45 | 55 | 59 | 57 | 48 | 37 | 23 | 9 | 33 |
| Avg Max Temp (°F) | 22 | 29 | 40 | 57 | 70 | 78 | 82 | 80 | 70 | 58 | 40 | 26 | 54 |
| Avg Precip (In.) | 1.06 | .8 | 1.84 | 2.94 | 3.68 | 4.31 | 4.07 | 4.64 | 3.78 | 2.3 | 2 | 1.05 | 32.47 |