| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 52b - Paleozoic Plateau/Coulee Section |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54636 - Holmen, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 12 | 24 | 36 | 48 | 57 | 62 | 60 | 51 | 39 | 26 | 13 | 36 |
| Avg Max Temp (°F) | 24 | 31 | 43 | 58 | 71 | 80 | 84 | 81 | 73 | 60 | 43 | 29 | 56 |
| Avg Precip (In.) | 1.07 | .88 | 1.94 | 3.34 | 3.69 | 4.15 | 4.41 | 4.5 | 3.69 | 2.28 | 2.22 | 1.17 | 33.34 |