| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 74b - Loess Plains |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 38068 - Somerville, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 32 | 40 | 48 | 58 | 65 | 69 | 67 | 60 | 48 | 40 | 32 | 49 |
| Avg Max Temp (°F) | 47 | 53 | 62 | 72 | 79 | 87 | 90 | 90 | 84 | 74 | 62 | 51 | 71 |
| Avg Precip (In.) | 4.3 | 4.25 | 5.51 | 5.31 | 5.38 | 4.36 | 4.21 | 3.04 | 3.74 | 3.35 | 5.24 | 5.54 | 54.21 |