Horicon, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 55.6 °F (high). Annual precipitation averages 34.5 Inches. Horicon 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 | 10.4 °F | 26.3 °F | 1.38 in. |
| February | 12.7 °F | 29.8 °F | 1.34 in. |
| March | 23.6 °F | 41.9 °F | 1.84 in. |
| April | 35.2 °F | 55.3 °F | 3.53 in. |
| May | 46.7 °F | 67.6 °F | 3.79 in. |
| June | 56.8 °F | 77.3 °F | 4.94 in. |
| July | 60.9 °F | 81.2 °F | 4.15 in. |
| August | 58.9 °F | 79.3 °F | 3.71 in. |
| September | 50.9 °F | 72.9 °F | 3.33 in. |
| October | 39.3 °F | 59.4 °F | 2.92 in. |
| November | 28.3 °F | 44.8 °F | 1.96 in. |
| December | 17.2 °F | 31.8 °F | 1.57 in. |
| Annual | 36.7 °F | 55.6 °F | 34.46 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |