| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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 54235 - Sturgeon Bay, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 11 | 21 | 32 | 43 | 53 | 59 | 57 | 50 | 39 | 28 | 16 | 35 |
| Avg Max Temp (°F) | 24 | 28 | 38 | 51 | 64 | 74 | 78 | 76 | 69 | 56 | 42 | 30 | 52 |
| Avg Precip (In.) | 2.04 | 1.29 | 2.08 | 2.63 | 2.71 | 3.45 | 3.08 | 3.65 | 3.46 | 2.82 | 2.67 | 2 | 31.87 |