| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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 Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| 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 49839 - Grand Marais, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 11 | 18 | 28 | 38 | 46 | 52 | 52 | 46 | 36 | 27 | 16 | 32 |
| Avg Max Temp (°F) | 26 | 29 | 38 | 50 | 64 | 72 | 77 | 76 | 68 | 56 | 41 | 30 | 52 |
| Avg Precip (In.) | 2.34 | 1.21 | 1.49 | 1.37 | 2.52 | 2.93 | 2.95 | 2.92 | 3.49 | 3.03 | 2.43 | 2.26 | 28.95 |