| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F 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: | 71g - Eastern Highland Rim |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 38549 - Byrdstown, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 27 | 35 | 42 | 52 | 61 | 65 | 63 | 57 | 44 | 36 | 29 | 45 |
| Avg Max Temp (°F) | 44 | 50 | 59 | 68 | 76 | 84 | 87 | 87 | 81 | 70 | 59 | 49 | 68 |
| Avg Precip (In.) | 4.64 | 4.15 | 5.14 | 4.18 | 5.26 | 4.72 | 4.56 | 3.9 | 3.84 | 3.25 | 4.43 | 5.09 | 53.17 |