Jefferson, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.1 °F (low) to 76.3 °F (high). Annual precipitation averages 50.6 Inches. Jefferson is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.1 °F | 56.8 °F | 4.17 in. |
| February | 37.6 °F | 61.1 °F | 4.16 in. |
| March | 44.6 °F | 68.9 °F | 4.97 in. |
| April | 51.8 °F | 76.4 °F | 4.53 in. |
| May | 61.4 °F | 83.3 °F | 4.79 in. |
| June | 69.2 °F | 90.0 °F | 4.78 in. |
| July | 72.3 °F | 93.6 °F | 2.99 in. |
| August | 71.1 °F | 94.2 °F | 2.73 in. |
| September | 64.1 °F | 88.4 °F | 3.93 in. |
| October | 52.2 °F | 78.2 °F | 4.65 in. |
| November | 42.7 °F | 66.6 °F | 3.96 in. |
| December | 36.1 °F | 58.3 °F | 4.91 in. |
| Annual | 53.1 °F | 76.3 °F | 50.57 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |