| 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. 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 55987 - Winona, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 12 | 24 | 36 | 48 | 58 | 63 | 60 | 51 | 40 | 27 | 13 | 36 |
| Avg Max Temp (°F) | 25 | 32 | 43 | 59 | 72 | 80 | 84 | 82 | 73 | 61 | 43 | 29 | 57 |
| Avg Precip (In.) | 1.42 | .8 | 1.85 | 3.35 | 3.85 | 4.17 | 4.49 | 4.6 | 3.81 | 2.27 | 2.22 | 1.22 | 34.05 |