| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 57a - Maumee Lake Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48138 - Grosse Ile, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 20 | 28 | 38 | 50 | 59 | 64 | 62 | 55 | 43 | 34 | 24 | 41 |
| Avg Max Temp (°F) | 32 | 35 | 45 | 57 | 70 | 79 | 84 | 82 | 75 | 62 | 49 | 37 | 59 |
| Avg Precip (In.) | 1.91 | 1.82 | 2.55 | 3.18 | 3.03 | 3.51 | 3.17 | 3.11 | 3.33 | 2.42 | 2.77 | 2.5 | 33.3 |