Henderson, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 24.9 °C (high). Annual precipitation averages 1243.1 Millimeters. Henderson 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 | 2.3 °C | 14.3 °C | 101.35 mm |
| February | 4.2 °C | 16.6 °C | 103.63 mm |
| March | 8.1 °C | 20.9 °C | 117.6 mm |
| April | 11.9 °C | 24.8 °C | 103.38 mm |
| May | 17.1 °C | 28.6 °C | 110.74 mm |
| June | 21.1 °C | 32.3 °C | 124.97 mm |
| July | 22.6 °C | 34.2 °C | 68.07 mm |
| August | 22.2 °C | 34.5 °C | 84.33 mm |
| September | 18.7 °C | 31.4 °C | 90.42 mm |
| October | 12.8 °C | 26 °C | 112.01 mm |
| November | 7.3 °C | 19.7 °C | 106.93 mm |
| December | 3.3 °C | 15.2 °C | 119.63 mm |
| Annual | 12.6 °C | 24.9 °C | 1243.06 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |