Knoxville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.5 °F (low) to 70 °F (high). Annual precipitation averages 52.4 Inches. Knoxville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.9 °F | 47.8 °F | 4.87 in. |
| February | 32.0 °F | 52.3 °F | 4.58 in. |
| March | 38.3 °F | 61.3 °F | 4.99 in. |
| April | 46.8 °F | 70.8 °F | 4.64 in. |
| May | 56.4 °F | 78.7 °F | 4.31 in. |
| June | 64.3 °F | 85.5 °F | 4.53 in. |
| July | 68.4 °F | 88.4 °F | 5.53 in. |
| August | 67.2 °F | 87.9 °F | 3.21 in. |
| September | 61.1 °F | 83.1 °F | 3.44 in. |
| October | 48.7 °F | 72.3 °F | 3.19 in. |
| November | 37.1 °F | 60.3 °F | 3.96 in. |
| December | 32.3 °F | 51.2 °F | 5.17 in. |
| Annual | 48.5 °F | 70 °F | 52.42 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |