| 2023 Hardiness Zone: | 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 53151 - New Berlin, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 16 | 26 | 37 | 47 | 57 | 63 | 61 | 53 | 41 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 27 | 32 | 42 | 55 | 68 | 78 | 83 | 80 | 72 | 60 | 45 | 32 | 56 |
| Avg Precip (In.) | 1.49 | 1.33 | 2.18 | 3.58 | 2.99 | 3.66 | 3.7 | 4.17 | 3.43 | 2.46 | 2.55 | 1.91 | 33.44 |