| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51g - Door Peninsula |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54234 - Sister Bay, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 10 | 20 | 31 | 42 | 52 | 58 | 58 | 50 | 39 | 28 | 16 | 34 |
| Avg Max Temp (°F) | 24 | 27 | 37 | 48 | 61 | 70 | 76 | 74 | 67 | 55 | 41 | 29 | 51 |
| Avg Precip (In.) | 1.89 | 1.24 | 2.08 | 2.56 | 2.8 | 3.28 | 3.23 | 3.51 | 3.47 | 2.68 | 2.54 | 1.85 | 31.11 |