Powell, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.1 °F (low) to 69.2 °F (high). Annual precipitation averages 57 Inches. Powell is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.5 °F | 47.0 °F | 5.18 in. |
| February | 31.5 °F | 51.5 °F | 5.25 in. |
| March | 38.0 °F | 60.7 °F | 5.31 in. |
| April | 46.5 °F | 70.5 °F | 5.38 in. |
| May | 55.9 °F | 78.3 °F | 4.54 in. |
| June | 63.9 °F | 84.7 °F | 4.71 in. |
| July | 67.7 °F | 87.5 °F | 5.91 in. |
| August | 66.6 °F | 87.0 °F | 3.59 in. |
| September | 60.6 °F | 82.2 °F | 4.06 in. |
| October | 48.4 °F | 71.4 °F | 3.22 in. |
| November | 37.1 °F | 59.6 °F | 4.08 in. |
| December | 32.0 °F | 50.1 °F | 5.74 in. |
| Annual | 48.1 °F | 69.2 °F | 56.97 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |