Forest Hills, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.3 °F (low) to 69.3 °F (high). Annual precipitation averages 53.8 Inches. Forest Hills 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 | 27.5 °F | 46.5 °F | 4.32 in. |
| February | 30.1 °F | 51.3 °F | 4.74 in. |
| March | 37.1 °F | 60.4 °F | 5.03 in. |
| April | 45.8 °F | 70.4 °F | 5.04 in. |
| May | 55.5 °F | 77.9 °F | 5.3 in. |
| June | 64.0 °F | 85.1 °F | 4.39 in. |
| July | 67.7 °F | 88.5 °F | 4.63 in. |
| August | 66.0 °F | 88.0 °F | 3.61 in. |
| September | 59.0 °F | 82.1 °F | 4.1 in. |
| October | 47.0 °F | 71.8 °F | 3.77 in. |
| November | 36.6 °F | 59.6 °F | 3.88 in. |
| December | 30.7 °F | 50.0 °F | 5.03 in. |
| Annual | 47.3 °F | 69.3 °F | 53.84 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |