Henderson, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 66.9 °F (high). Annual precipitation averages 46.8 Inches. Henderson is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 41.5 °F | 3.41 in. |
| February | 27.7 °F | 46.3 °F | 3.19 in. |
| March | 35.9 °F | 56.1 °F | 4.38 in. |
| April | 46.0 °F | 68.1 °F | 5.03 in. |
| May | 56.8 °F | 76.9 °F | 5.04 in. |
| June | 65.2 °F | 85.1 °F | 4.13 in. |
| July | 68.3 °F | 87.7 °F | 4.11 in. |
| August | 65.8 °F | 86.8 °F | 2.92 in. |
| September | 58.2 °F | 82.0 °F | 3.28 in. |
| October | 47.3 °F | 70.5 °F | 3.5 in. |
| November | 36.1 °F | 56.4 °F | 3.85 in. |
| December | 28.9 °F | 45.6 °F | 3.91 in. |
| Annual | 46.8 °F | 66.9 °F | 46.75 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |