| 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: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 68a - Cumberland Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 37377 - Signal Mountain, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 30 | 37 | 44 | 53 | 62 | 66 | 65 | 59 | 46 | 38 | 31 | 47 |
| Avg Max Temp (°F) | 48 | 54 | 62 | 71 | 78 | 85 | 88 | 87 | 82 | 72 | 61 | 51 | 70 |
| Avg Precip (In.) | 5.93 | 5.36 | 6.78 | 4.79 | 5.54 | 4.55 | 4.66 | 3.9 | 4.47 | 3.73 | 5.13 | 6.08 | 60.92 |