Horn Lake, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.8 °F (low) to 71.6 °F (high). Annual precipitation averages 55.6 Inches. 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 | 31.4 °F | 48.8 °F | 4.34 in. |
| February | 34.6 °F | 53.7 °F | 4.78 in. |
| March | 42.2 °F | 62.5 °F | 5.7 in. |
| April | 51.2 °F | 72.3 °F | 5.81 in. |
| May | 60.8 °F | 80.3 °F | 5.26 in. |
| June | 68.8 °F | 87.9 °F | 4.5 in. |
| July | 72.1 °F | 90.6 °F | 4.4 in. |
| August | 70.4 °F | 90.2 °F | 3.27 in. |
| September | 63.2 °F | 85.0 °F | 3.26 in. |
| October | 51.4 °F | 74.1 °F | 4.03 in. |
| November | 40.9 °F | 61.6 °F | 4.6 in. |
| December | 34.5 °F | 51.7 °F | 5.64 in. |
| Annual | 51.8 °F | 71.6 °F | 55.59 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |