| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 67g - Southern Shale Valleys |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 37742 - Greenback, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 29 | 37 | 44 | 54 | 62 | 67 | 66 | 59 | 46 | 37 | 30 | 47 |
| Avg Max Temp (°F) | 47 | 52 | 61 | 70 | 78 | 85 | 88 | 87 | 82 | 71 | 60 | 50 | 69 |
| Avg Precip (In.) | 4.99 | 4.39 | 5.58 | 4.19 | 4.84 | 4.33 | 4.56 | 3.42 | 3.33 | 2.95 | 4.28 | 4.91 | 51.78 |