| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| 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: | 51d - Central Sand Ridges |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53949 - Montello, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 10 | 22 | 34 | 46 | 55 | 60 | 57 | 48 | 37 | 24 | 12 | 34 |
| Avg Max Temp (°F) | 25 | 30 | 42 | 56 | 69 | 79 | 82 | 80 | 71 | 59 | 43 | 30 | 56 |
| Avg Precip (In.) | 1.27 | 1.17 | 2.2 | 3.33 | 3.43 | 4.08 | 4.1 | 4.31 | 3.77 | 2.29 | 2.39 | 1.39 | 33.73 |