| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F Zone 4b: -25°F to -20°F Zone 2b: -45°F to -40°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50t - North Shore Highlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55604 - Grand Marais, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 9 | 19 | 30 | 37 | 44 | 51 | 53 | 46 | 36 | 25 | 11 | 31 |
| Avg Max Temp (°F) | 22 | 27 | 35 | 47 | 57 | 65 | 71 | 72 | 63 | 52 | 37 | 26 | 48 |
| Avg Precip (In.) | .74 | .49 | 1.13 | 1.19 | 2.49 | 3.49 | 3.4 | 2.99 | 3.42 | 2.62 | 1.75 | .83 | 24.55 |