| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 66f - Limestone Valleys and Coves | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 37683 - Mountain City, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 30 | 36 | 45 | 53 | 58 | 56 | 50 | 37 | 29 | 23 | 38 |
| Avg Max Temp (°F) | 44 | 47 | 56 | 64 | 72 | 78 | 82 | 81 | 76 | 66 | 56 | 47 | 64 |
| Avg Precip (In.) | 3.91 | 4.09 | 4.72 | 4.05 | 5.21 | 4.29 | 4.39 | 3.94 | 3.67 | 2.86 | 3.21 | 3.88 | 48.22 |