| 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 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 52a - Savanna Section | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53809 - Fennimore, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 12 | 24 | 35 | 46 | 56 | 60 | 59 | 50 | 38 | 26 | 13 | 36 |
| Avg Max Temp (°F) | 24 | 30 | 42 | 56 | 69 | 78 | 82 | 79 | 71 | 59 | 42 | 29 | 55 |
| Avg Precip (In.) | 1.06 | 1.14 | 2.14 | 3.44 | 3.75 | 4.41 | 4.19 | 4.53 | 3.35 | 2.42 | 2.41 | 1.33 | 34.16 |