Powell, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 21 °C (high). Annual precipitation averages 1471.2 Millimeters. Powell is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.4 °C | 9.4 °C | 147.32 mm |
| February | 0.3 °C | 11.8 °C | 141.99 mm |
| March | 3.7 °C | 16.5 °C | 140.72 mm |
| April | 7.7 °C | 21.2 °C | 131.06 mm |
| May | 12.9 °C | 25.3 °C | 116.84 mm |
| June | 17.9 °C | 29.2 °C | 116.33 mm |
| July | 19.3 °C | 30.7 °C | 113.03 mm |
| August | 18.9 °C | 30.4 °C | 91.44 mm |
| September | 15.4 °C | 27.8 °C | 110.49 mm |
| October | 9.2 °C | 22.2 °C | 85.85 mm |
| November | 3.2 °C | 15.8 °C | 123.7 mm |
| December | 0.5 °C | 11.2 °C | 152.4 mm |
| Annual | 9 °C | 21 °C | 1471.17 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |