Powell, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.3 °F (low) to 77.1 °F (high). Annual precipitation averages 43.6 Inches. Powell 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 | 36.0 °F | 57.7 °F | 3.34 in. |
| February | 39.6 °F | 61.8 °F | 3.3 in. |
| March | 46.9 °F | 68.7 °F | 4.09 in. |
| April | 53.8 °F | 76.0 °F | 3.91 in. |
| May | 63.6 °F | 83.3 °F | 4.47 in. |
| June | 71.1 °F | 90.6 °F | 3.99 in. |
| July | 73.7 °F | 94.6 °F | 2.1 in. |
| August | 73.4 °F | 95.7 °F | 2.46 in. |
| September | 66.6 °F | 89.6 °F | 3.29 in. |
| October | 55.9 °F | 79.4 °F | 5.35 in. |
| November | 45.4 °F | 67.9 °F | 3.47 in. |
| December | 37.9 °F | 59.5 °F | 3.87 in. |
| Annual | 55.3 °F | 77.1 °F | 43.64 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 |