Iron Belt, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.4 °C (low) to 10.1 °C (high). Annual precipitation averages 937 Millimeters. Iron Belt is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.9 °C | -6.6 °C | 49.02 mm |
| February | -16.2 °C | -3.8 °C | 34.8 mm |
| March | -10.4 °C | 2.5 °C | 46.48 mm |
| April | -2.7 °C | 9.4 °C | 75.18 mm |
| May | 4.7 °C | 17.4 °C | 93.98 mm |
| June | 10.2 °C | 22.7 °C | 107.7 mm |
| July | 12.9 °C | 24.8 °C | 123.44 mm |
| August | 11.5 °C | 23.8 °C | 97.03 mm |
| September | 7.5 °C | 19.6 °C | 101.35 mm |
| October | 0.9 °C | 11.7 °C | 99.82 mm |
| November | -5.6 °C | 3 °C | 60.96 mm |
| December | -12.2 °C | -3.6 °C | 47.24 mm |
| Annual | -1.4 °C | 10.1 °C | 937 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |