| 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 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 50c - St. Croix Pine Barrens | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54847 - Iron River, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -2 | 4 | 16 | 28 | 40 | 49 | 55 | 54 | 45 | 35 | 22 | 6 | 29 |
| Avg Max Temp (°F) | 19 | 26 | 37 | 52 | 67 | 75 | 80 | 77 | 67 | 55 | 37 | 23 | 51 |
| Avg Precip (In.) | 1.3 | .91 | 1.96 | 2.21 | 3 | 3.86 | 4.5 | 4.43 | 3.81 | 2.72 | 2.36 | 1.21 | 32.28 |