Knoxville, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.5 °F (low) to 72.3 °F (high). Annual precipitation averages 50.2 Inches. Knoxville is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.1 °F | 49.7 °F | 3.51 in. |
| February | 32.2 °F | 54.8 °F | 3.18 in. |
| March | 39.6 °F | 63.5 °F | 4.57 in. |
| April | 48.3 °F | 72.8 °F | 5.01 in. |
| May | 58.2 °F | 80.1 °F | 5.41 in. |
| June | 66.8 °F | 87.9 °F | 4.05 in. |
| July | 70.0 °F | 92.6 °F | 3.79 in. |
| August | 68.9 °F | 92.6 °F | 3.63 in. |
| September | 61.3 °F | 85.5 °F | 3.74 in. |
| October | 49.2 °F | 74.5 °F | 4.1 in. |
| November | 39.0 °F | 61.9 °F | 4.93 in. |
| December | 31.6 °F | 51.9 °F | 4.26 in. |
| Annual | 49.5 °F | 72.3 °F | 50.18 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |