| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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: | 53c - Southeastern Wisconsin Savannah and Till Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53598 - Windsor, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 24 | 35 | 46 | 55 | 60 | 58 | 50 | 38 | 27 | 15 | 36 |
| Avg Max Temp (°F) | 25 | 30 | 42 | 56 | 69 | 78 | 82 | 80 | 72 | 60 | 43 | 30 | 56 |
| Avg Precip (In.) | 1.18 | 1.2 | 2.13 | 3.31 | 3.34 | 4.08 | 3.96 | 4.29 | 3.35 | 2.3 | 2.34 | 1.51 | 33 |