| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 67f - Southern Limestone/Dolomite Valleys and Low Rolling Hills |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 37849 - Powell, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 29 | 36 | 43 | 53 | 61 | 66 | 65 | 58 | 45 | 37 | 30 | 46 |
| Avg Max Temp (°F) | 46 | 51 | 60 | 70 | 77 | 84 | 87 | 86 | 81 | 70 | 59 | 49 | 68 |
| Avg Precip (In.) | 4.97 | 4.29 | 5.59 | 4.28 | 4.96 | 4.78 | 4.94 | 3.67 | 3.82 | 3.02 | 4.65 | 5.1 | 54.08 |