| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ac - Onaway Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49746 - Hillman, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 8 | 18 | 30 | 40 | 50 | 55 | 53 | 46 | 36 | 27 | 16 | 32 |
| Avg Max Temp (°F) | 27 | 29 | 39 | 52 | 66 | 75 | 80 | 77 | 69 | 57 | 43 | 31 | 54 |
| Avg Precip (In.) | 1.87 | 1.34 | 1.85 | 2.22 | 2.65 | 2.72 | 3.22 | 3.6 | 3.2 | 2.55 | 2.14 | 1.91 | 29.25 |