| 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. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 53c - Southeastern Wisconsin Savannah and Till Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53156 - Palmyra, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 24 | 35 | 46 | 56 | 61 | 59 | 50 | 39 | 27 | 15 | 36 |
| Avg Max Temp (°F) | 26 | 31 | 43 | 56 | 69 | 79 | 83 | 80 | 73 | 61 | 44 | 31 | 56 |
| Avg Precip (In.) | 1.36 | 1.23 | 2.17 | 3.43 | 3.23 | 3.97 | 4 | 4.39 | 3.48 | 2.56 | 2.5 | 1.68 | 34.02 |