| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 53d - Lake Michigan Lacustrine Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54935 - Fond du Lac, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 24 | 35 | 47 | 56 | 61 | 59 | 51 | 40 | 28 | 15 | 36 |
| Avg Max Temp (°F) | 24 | 29 | 41 | 54 | 68 | 77 | 81 | 78 | 70 | 58 | 42 | 29 | 54 |
| Avg Precip (In.) | 1.15 | 1.03 | 1.91 | 2.86 | 3.02 | 3.66 | 3.64 | 4.18 | 3.51 | 2.39 | 2.06 | 1.42 | 30.84 |