Henderson, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56 °F (low) to 77.6 °F (high). Annual precipitation averages 51.9 Inches. Henderson is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.4 °F | 61.4 °F | 3.66 in. |
| February | 41.3 °F | 64.7 °F | 3.38 in. |
| March | 47.4 °F | 71.0 °F | 3.62 in. |
| April | 54.2 °F | 77.8 °F | 3.26 in. |
| May | 62.4 °F | 84.4 °F | 3.49 in. |
| June | 69.7 °F | 89.4 °F | 6.21 in. |
| July | 72.5 °F | 92.1 °F | 5.93 in. |
| August | 72.2 °F | 90.6 °F | 7.44 in. |
| September | 68.0 °F | 86.3 °F | 4.83 in. |
| October | 57.6 °F | 79.0 °F | 4.03 in. |
| November | 46.8 °F | 70.3 °F | 2.56 in. |
| December | 41.1 °F | 63.8 °F | 3.47 in. |
| Annual | 56 °F | 77.6 °F | 51.88 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |