Cornucopia, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Annual precipitation averages 791.7 Millimeters. Cornucopia is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -5.3 °C | 33.78 mm |
| February | -13.6 °C | -2.9 °C | 28.45 mm |
| March | -8.1 °C | 2.7 °C | 42.42 mm |
| April | -1.5 °C | 9 °C | 71.88 mm |
| May | 4.1 °C | 16.1 °C | 82.8 mm |
| June | 9.3 °C | 21.6 °C | 96.01 mm |
| July | 13.3 °C | 25.2 °C | 100.33 mm |
| August | 13.1 °C | 24.4 °C | 84.84 mm |
| September | 9.1 °C | 20.1 °C | 80.26 mm |
| October | 2.9 °C | 12.3 °C | 76.2 mm |
| November | -3.5 °C | 4.3 °C | 51.31 mm |
| December | -10.2 °C | -2.4 °C | 43.43 mm |
| Annual | 0 °C | 10.4 °C | 791.71 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |