Austwell, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63.3 °F (low) to 78.3 °F (high). Annual precipitation averages 39.9 Inches. Austwell is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.1 °F | 63.7 °F | 2.74 in. |
| February | 50.2 °F | 67.0 °F | 1.96 in. |
| March | 56.7 °F | 71.7 °F | 2.99 in. |
| April | 63.0 °F | 77.1 °F | 2.21 in. |
| May | 70.5 °F | 83.2 °F | 3.99 in. |
| June | 75.9 °F | 88.4 °F | 3.79 in. |
| July | 77.5 °F | 89.7 °F | 3.56 in. |
| August | 77.1 °F | 91.0 °F | 3.69 in. |
| September | 73.2 °F | 88.2 °F | 5.93 in. |
| October | 65.8 °F | 81.4 °F | 3.73 in. |
| November | 55.7 °F | 72.6 °F | 2.84 in. |
| December | 48.3 °F | 65.7 °F | 2.48 in. |
| Annual | 63.3 °F | 78.3 °F | 39.91 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |