Horn Lake, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 22 °C (high). Annual precipitation averages 1412 Millimeters. Horn Lake is located in USDA Plant Hardiness Zone 8a. 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 | -0.3 °C | 9.3 °C | 110.24 mm |
| February | 1.4 °C | 12.1 °C | 121.41 mm |
| March | 5.7 °C | 16.9 °C | 144.78 mm |
| April | 10.7 °C | 22.4 °C | 147.57 mm |
| May | 16 °C | 26.8 °C | 133.6 mm |
| June | 20.4 °C | 31.1 °C | 114.3 mm |
| July | 22.3 °C | 32.6 °C | 111.76 mm |
| August | 21.3 °C | 32.3 °C | 83.06 mm |
| September | 17.3 °C | 29.4 °C | 82.8 mm |
| October | 10.8 °C | 23.4 °C | 102.36 mm |
| November | 4.9 °C | 16.4 °C | 116.84 mm |
| December | 1.4 °C | 10.9 °C | 143.26 mm |
| Annual | 11 °C | 22 °C | 1411.98 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |