Jacksonville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.1 °C (low) to 25 °C (high). Annual precipitation averages 1223.5 Millimeters. Jacksonville 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 | 3.1 °C | 14.6 °C | 101.09 mm |
| February | 4.8 °C | 16.8 °C | 98.55 mm |
| March | 8.6 °C | 20.9 °C | 112.01 mm |
| April | 12.2 °C | 24.9 °C | 104.65 mm |
| May | 17.3 °C | 28.7 °C | 122.43 mm |
| June | 21.2 °C | 32.2 °C | 117.6 mm |
| July | 22.7 °C | 34.2 °C | 68.83 mm |
| August | 22.4 °C | 34.6 °C | 86.11 mm |
| September | 19.2 °C | 31.4 °C | 86.87 mm |
| October | 13.4 °C | 26.2 °C | 105.41 mm |
| November | 7.9 °C | 19.8 °C | 103.63 mm |
| December | 4 °C | 15.4 °C | 116.33 mm |
| Annual | 13.1 °C | 25 °C | 1223.51 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |