Bloomington, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 13.5 °C (high). Annual precipitation averages 965.5 Millimeters. Bloomington is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.3 °C | -3.2 °C | 31.5 mm |
| February | -10.3 °C | -0.6 °C | 31.75 mm |
| March | -3.8 °C | 6.4 °C | 50.55 mm |
| April | 2.5 °C | 14 °C | 98.04 mm |
| May | 9 °C | 20.5 °C | 114.81 mm |
| June | 14.7 °C | 25.7 °C | 148.08 mm |
| July | 16.8 °C | 27.6 °C | 120.65 mm |
| August | 15.7 °C | 26.6 °C | 101.35 mm |
| September | 11 °C | 22.8 °C | 99.57 mm |
| October | 4.3 °C | 15.6 °C | 72.9 mm |
| November | -2.3 °C | 7.1 °C | 55.37 mm |
| December | -8.3 °C | 0 °C | 40.89 mm |
| Annual | 3.1 °C | 13.5 °C | 965.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |