| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51b - Central Wisconsin Undulating Till Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54451 - Medford, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -1 | 5 | 18 | 31 | 43 | 52 | 57 | 55 | 46 | 35 | 22 | 7 | 31 |
| Avg Max Temp (°F) | 20 | 26 | 37 | 53 | 67 | 74 | 79 | 77 | 67 | 55 | 38 | 24 | 51 |
| Avg Precip (In.) | 1.16 | .9 | 1.84 | 2.52 | 3.23 | 4.4 | 4.02 | 4.6 | 4.41 | 2.57 | 2.15 | 1.27 | 33.08 |