Jellico, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.8 °F (low) to 67.9 °F (high). Annual precipitation averages 54.4 Inches. Jellico is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.7 °F | 45.5 °F | 4.66 in. |
| February | 28.3 °F | 49.9 °F | 4.78 in. |
| March | 34.2 °F | 59.1 °F | 5.23 in. |
| April | 42.6 °F | 69.5 °F | 5.05 in. |
| May | 52.9 °F | 77.2 °F | 4.69 in. |
| June | 60.8 °F | 84.0 °F | 4.96 in. |
| July | 65.0 °F | 86.3 °F | 5.71 in. |
| August | 63.5 °F | 85.5 °F | 3.92 in. |
| September | 56.9 °F | 80.2 °F | 3.61 in. |
| October | 44.4 °F | 69.8 °F | 2.91 in. |
| November | 33.6 °F | 58.4 °F | 3.69 in. |
| December | 29.3 °F | 49.1 °F | 5.23 in. |
| Annual | 44.8 °F | 67.9 °F | 54.44 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |