| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 53d - Lake Michigan Lacustrine Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54208 - Denmark, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 23 | 34 | 46 | 55 | 60 | 59 | 50 | 39 | 27 | 15 | 36 |
| Avg Max Temp (°F) | 25 | 30 | 41 | 55 | 68 | 78 | 82 | 79 | 71 | 59 | 43 | 30 | 55 |
| Avg Precip (In.) | 1.45 | 1.11 | 2.05 | 2.75 | 2.99 | 3.81 | 3.59 | 3.86 | 3.35 | 2.47 | 2.3 | 1.53 | 31.26 |