| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F 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 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ab - Cheboygan Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49707 - Alpena, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 12 | 21 | 32 | 44 | 53 | 59 | 58 | 50 | 39 | 29 | 19 | 36 |
| Avg Max Temp (°F) | 27 | 28 | 36 | 48 | 61 | 70 | 77 | 75 | 67 | 55 | 42 | 32 | 52 |
| Avg Precip (In.) | 1.72 | 1.31 | 1.89 | 2.16 | 2.8 | 2.64 | 3.15 | 3.44 | 3.08 | 2.42 | 2.04 | 1.85 | 28.5 |