| 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 Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 67f - Southern Limestone/Dolomite Valleys and Low Rolling Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 37405 - Chattanooga, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 29 | 32 | 39 | 46 | 55 | 64 | 68 | 67 | 61 | 48 | 39 | 32 | 48 |
| Avg Max Temp (°F) | 48 | 54 | 62 | 72 | 79 | 86 | 89 | 88 | 82 | 72 | 61 | 52 | 70 |
| Avg Precip (In.) | 5.41 | 4.85 | 6.16 | 4.17 | 4.3 | 3.94 | 4.51 | 3.55 | 4.32 | 3.32 | 4.86 | 4.96 | 54.35 |