| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 53b - Kettle Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53132 - Franklin, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 16 | 26 | 36 | 47 | 57 | 62 | 61 | 53 | 41 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 27 | 32 | 43 | 55 | 68 | 78 | 82 | 80 | 72 | 60 | 45 | 33 | 56 |
| Avg Precip (In.) | 1.51 | 1.35 | 2.25 | 3.64 | 3.11 | 3.82 | 3.76 | 4.28 | 3.42 | 2.49 | 2.61 | 1.93 | 34.17 |