| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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: | 50x - Grand Marais Lakeshore |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49816 - Chatham, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 9 | 18 | 29 | 39 | 48 | 54 | 53 | 46 | 37 | 26 | 14 | 32 |
| Avg Max Temp (°F) | 23 | 28 | 36 | 49 | 64 | 72 | 77 | 75 | 66 | 55 | 39 | 28 | 51 |
| Avg Precip (In.) | 2.38 | 1.51 | 2.22 | 2.37 | 2.69 | 3.37 | 3.25 | 3.65 | 3.78 | 3.26 | 2.94 | 2.42 | 33.83 |