Unicoi, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.1 °F (low) to 67.5 °F (high). Annual precipitation averages 50.1 Inches. Unicoi is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.0 °F | 46.7 °F | 3.73 in. |
| February | 28.2 °F | 50.6 °F | 3.89 in. |
| March | 34.4 °F | 58.7 °F | 4.19 in. |
| April | 42.6 °F | 68.7 °F | 4.54 in. |
| May | 51.2 °F | 75.9 °F | 4.1 in. |
| June | 59.2 °F | 82.1 °F | 4.8 in. |
| July | 62.8 °F | 84.8 °F | 5.79 in. |
| August | 62.0 °F | 84.1 °F | 5.04 in. |
| September | 55.6 °F | 79.6 °F | 3.63 in. |
| October | 44.1 °F | 69.9 °F | 2.88 in. |
| November | 34.1 °F | 59.1 °F | 3.26 in. |
| December | 29.1 °F | 50.1 °F | 4.26 in. |
| Annual | 44.1 °F | 67.5 °F | 50.11 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |