| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | 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: | 71g - Eastern Highland Rim |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 37166 - Smithville, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 27 | 34 | 42 | 51 | 60 | 64 | 63 | 55 | 43 | 34 | 28 | 44 |
| Avg Max Temp (°F) | 45 | 50 | 60 | 69 | 76 | 84 | 87 | 87 | 80 | 70 | 60 | 49 | 68 |
| Avg Precip (In.) | 5.09 | 4.31 | 6.06 | 4.4 | 5.44 | 4.51 | 4.92 | 3.99 | 4.15 | 3.5 | 4.85 | 5.56 | 56.77 |