Hortonville, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.7 °C (high). Annual precipitation averages 861.8 Millimeters. Hortonville 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 | -12.5 °C | -3.7 °C | 34.54 mm |
| February | -11.3 °C | -1.6 °C | 30.73 mm |
| March | -5.6 °C | 4.7 °C | 48.51 mm |
| April | 1 °C | 12.4 °C | 82.55 mm |
| May | 7.8 °C | 19.6 °C | 98.04 mm |
| June | 13.4 °C | 24.9 °C | 118.62 mm |
| July | 15.7 °C | 27.4 °C | 101.09 mm |
| August | 14.7 °C | 26.2 °C | 95.25 mm |
| September | 10.1 °C | 22.2 °C | 85.6 mm |
| October | 3.6 °C | 14.6 °C | 74.68 mm |
| November | -2.6 °C | 6.4 °C | 47.24 mm |
| December | -8.8 °C | -0.7 °C | 44.96 mm |
| Annual | 2.1 °C | 12.7 °C | 861.81 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 5a : -28.9°C to -26.1°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 |