| 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 3b: -35F to -30F |
| 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: | 51a - St. Croix Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54020 - Osceola, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 1 | 8 | 21 | 34 | 47 | 55 | 60 | 58 | 49 | 38 | 24 | 8 | 34 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 57 | 71 | 79 | 83 | 80 | 71 | 59 | 41 | 27 | 55 |
| Avg Precip (In.) | .94 | .72 | 1.63 | 2.51 | 3.38 | 4.53 | 4.15 | 4.62 | 3.5 | 2.46 | 1.85 | .89 | 31.16 |