| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°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: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 52b - Paleozoic Plateau/Coulee Section |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54758 - Osseo, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 1 | 8 | 20 | 33 | 45 | 54 | 59 | 57 | 47 | 36 | 23 | 9 | 33 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 56 | 69 | 78 | 81 | 79 | 70 | 58 | 40 | 26 | 54 |
| Avg Precip (In.) | 1.08 | .84 | 1.91 | 3.02 | 3.65 | 4.25 | 4.42 | 4.52 | 3.96 | 2.41 | 2.19 | 1.18 | 33.42 |