| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep.1 - Sep. 10 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50j - Brule and Paint Rive Drumlins |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49935 - Iron River, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -2 | 0 | 12 | 26 | 38 | 47 | 52 | 50 | 41 | 31 | 20 | 6 | 27 |
| Avg Max Temp (°F) | 20 | 26 | 36 | 50 | 65 | 73 | 77 | 74 | 65 | 53 | 37 | 24 | 50 |
| Avg Precip (In.) | 1.18 | .89 | 1.74 | 2.23 | 3.19 | 3.75 | 3.91 | 3.88 | 3.84 | 2.8 | 2.11 | 1.35 | 30.88 |