| 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. 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 |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53562 - Middleton, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 12 | 23 | 34 | 46 | 55 | 60 | 58 | 49 | 37 | 26 | 13 | 35 |
| Avg Max Temp (°F) | 25 | 31 | 42 | 56 | 69 | 78 | 82 | 80 | 72 | 60 | 44 | 30 | 56 |
| Avg Precip (In.) | 1.15 | 1.15 | 2.16 | 3.49 | 3.42 | 4.38 | 4.04 | 4.14 | 3.28 | 2.39 | 2.35 | 1.37 | 33.33 |