Hewitt, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.2 °F (low) to 77.6 °F (high). Annual precipitation averages 37.4 Inches. Hewitt 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 | 35.8 °F | 58.2 °F | 2.69 in. |
| February | 39.4 °F | 62.2 °F | 2.68 in. |
| March | 46.7 °F | 69.0 °F | 3.49 in. |
| April | 54.3 °F | 76.9 °F | 3.08 in. |
| May | 63.3 °F | 84.2 °F | 4.39 in. |
| June | 70.5 °F | 91.4 °F | 3.84 in. |
| July | 73.2 °F | 95.4 °F | 1.62 in. |
| August | 73.2 °F | 96.2 °F | 2.37 in. |
| September | 66.7 °F | 89.7 °F | 3.13 in. |
| October | 56.0 °F | 79.8 °F | 3.96 in. |
| November | 46.1 °F | 68.1 °F | 3.01 in. |
| December | 37.7 °F | 59.8 °F | 3.18 in. |
| Annual | 55.2 °F | 77.6 °F | 37.44 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |