| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 57a - Maumee Lake Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48060 - Port Huron, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 25 | 36 | 47 | 57 | 62 | 61 | 54 | 42 | 32 | 22 | 39 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 54 | 66 | 76 | 82 | 80 | 73 | 60 | 47 | 36 | 57 |
| Avg Precip (In.) | 1.81 | 1.61 | 2.23 | 2.99 | 2.73 | 3.25 | 2.83 | 3.05 | 3.43 | 2.46 | 2.81 | 2.14 | 31.36 |