| 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. 11 - Apr. 20 |
| 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 38261 - Union City, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 29 | 37 | 46 | 56 | 64 | 68 | 65 | 58 | 46 | 37 | 29 | 47 |
| Avg Max Temp (°F) | 43 | 49 | 59 | 69 | 78 | 86 | 90 | 88 | 82 | 72 | 59 | 47 | 68 |
| Avg Precip (In.) | 3.78 | 4.07 | 4.97 | 4.87 | 5.06 | 4.76 | 4.22 | 3.17 | 3.27 | 3.76 | 4.97 | 4.99 | 51.89 |