| 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 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56d - Michigan Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49129 - Union Pier, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 28 | 38 | 48 | 58 | 62 | 61 | 53 | 43 | 33 | 22 | 40 |
| Avg Max Temp (°F) | 32 | 36 | 48 | 59 | 71 | 80 | 83 | 82 | 75 | 63 | 49 | 36 | 60 |
| Avg Precip (In.) | 2.22 | 1.74 | 2.7 | 3.53 | 3.55 | 4.03 | 3.59 | 3.84 | 3.88 | 3.12 | 3.46 | 2.89 | 38.55 |