Walnut Hill, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.2 °F (low) to 68 °F (high). Annual precipitation averages 46.8 Inches. Walnut Hill 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 | 26.4 °F | 46.3 °F | 3.92 in. |
| February | 28.9 °F | 50.5 °F | 3.96 in. |
| March | 35.4 °F | 59.2 °F | 4.45 in. |
| April | 43.8 °F | 69.3 °F | 4.05 in. |
| May | 52.9 °F | 76.9 °F | 4.16 in. |
| June | 61.0 °F | 83.2 °F | 4.46 in. |
| July | 64.7 °F | 86.0 °F | 4.86 in. |
| August | 63.4 °F | 85.3 °F | 3.81 in. |
| September | 57.2 °F | 80.6 °F | 2.87 in. |
| October | 45.1 °F | 70.2 °F | 2.93 in. |
| November | 34.5 °F | 59.0 °F | 2.98 in. |
| December | 29.4 °F | 49.5 °F | 4.39 in. |
| Annual | 45.2 °F | 68 °F | 46.84 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |