Bellevue, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 12.2 °C (high). Annual precipitation averages 806 Millimeters. Bellevue is located in USDA Plant Hardiness Zone 5b. 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 | -12.1 °C | -3.8 °C | 37.85 mm |
| February | -11 °C | -1.9 °C | 28.45 mm |
| March | -5.4 °C | 4.2 °C | 43.43 mm |
| April | 0.9 °C | 11.5 °C | 77.72 mm |
| May | 7.3 °C | 18.7 °C | 88.9 mm |
| June | 12.9 °C | 23.9 °C | 102.62 mm |
| July | 15.4 °C | 26.6 °C | 91.19 mm |
| August | 14.7 °C | 25.7 °C | 86.87 mm |
| September | 10.3 °C | 21.7 °C | 83.82 mm |
| October | 3.9 °C | 14.2 °C | 72.64 mm |
| November | -2.2 °C | 6.3 °C | 50.04 mm |
| December | -8.2 °C | -0.7 °C | 42.42 mm |
| Annual | 2.2 °C | 12.2 °C | 805.95 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |