| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| 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: | 50ae - Mio Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49738 - Grayling, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 7 | 16 | 28 | 39 | 49 | 53 | 52 | 44 | 34 | 25 | 15 | 31 |
| Avg Max Temp (°F) | 25 | 28 | 39 | 52 | 67 | 76 | 80 | 77 | 68 | 56 | 42 | 30 | 53 |
| Avg Precip (In.) | 1.81 | 1.31 | 1.98 | 2.57 | 3.05 | 3.38 | 3.65 | 3.78 | 3.93 | 3.3 | 2.47 | 1.87 | 33.11 |