Belleville, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.8 °C (high). Annual precipitation averages 970.3 Millimeters. Belleville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.7 °C | -2.7 °C | 38.35 mm |
| February | -10 °C | -0.4 °C | 39.88 mm |
| March | -4.2 °C | 6.4 °C | 53.34 mm |
| April | 2.1 °C | 14.1 °C | 97.28 mm |
| May | 8.6 °C | 20.7 °C | 111 mm |
| June | 14.3 °C | 26 °C | 142.49 mm |
| July | 16.5 °C | 28 °C | 110.24 mm |
| August | 15.4 °C | 27.1 °C | 108.71 mm |
| September | 10.6 °C | 23.1 °C | 92.96 mm |
| October | 4.2 °C | 15.9 °C | 73.91 mm |
| November | -2.1 °C | 7.4 °C | 57.66 mm |
| December | -7.9 °C | 0.4 °C | 44.45 mm |
| Annual | 3 °C | 13.8 °C | 970.27 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |