| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 53b - Kettle Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53223 - Milwaukee, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 26 | 36 | 46 | 56 | 62 | 60 | 52 | 41 | 29 | 18 | 38 |
| Avg Max Temp (°F) | 27 | 32 | 42 | 54 | 67 | 77 | 82 | 80 | 72 | 60 | 45 | 32 | 56 |
| Avg Precip (In.) | 1.49 | 1.29 | 2.09 | 3.42 | 2.98 | 3.68 | 3.77 | 4.11 | 3.45 | 2.44 | 2.49 | 1.88 | 33.09 |