| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F 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 11 - May 20 |
| 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 54937 - Fond du Lac, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 24 | 36 | 47 | 56 | 61 | 60 | 51 | 40 | 28 | 15 | 37 |
| Avg Max Temp (°F) | 24 | 29 | 41 | 55 | 68 | 77 | 82 | 79 | 71 | 59 | 42 | 29 | 55 |
| Avg Precip (In.) | 1.14 | 1.03 | 1.9 | 2.83 | 3 | 3.64 | 3.61 | 4.18 | 3.5 | 2.37 | 2.04 | 1.4 | 30.63 |