Horn Hill, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.7 °C (low) to 25.7 °C (high). Annual precipitation averages 1547.4 Millimeters. Horn Hill is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.9 °C | 16 °C | 128.52 mm |
| February | 4.8 °C | 18.4 °C | 128.27 mm |
| March | 8.1 °C | 22.2 °C | 135.89 mm |
| April | 11.8 °C | 26 °C | 125.22 mm |
| May | 16.4 °C | 29.9 °C | 110.49 mm |
| June | 20.6 °C | 32.6 °C | 157.48 mm |
| July | 22 °C | 33.6 °C | 171.45 mm |
| August | 21.8 °C | 33.2 °C | 142.49 mm |
| September | 19.3 °C | 31.4 °C | 120.14 mm |
| October | 13.1 °C | 26.8 °C | 92.46 mm |
| November | 7.1 °C | 21.2 °C | 106.93 mm |
| December | 4.6 °C | 17.2 °C | 128.02 mm |
| Annual | 12.7 °C | 25.7 °C | 1547.36 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |