| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| 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 53021 - Fredonia, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 26 | 36 | 46 | 55 | 61 | 61 | 52 | 41 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 26 | 31 | 41 | 53 | 66 | 76 | 81 | 79 | 71 | 59 | 44 | 32 | 55 |
| Avg Precip (In.) | 1.45 | 1.17 | 2.01 | 3.22 | 3.01 | 3.67 | 3.82 | 4.19 | 3.51 | 2.46 | 2.44 | 1.81 | 32.77 |