Fairmount, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.7 °F (low) to 66.1 °F (high). Annual precipitation averages 68.5 Inches. Fairmount is located in USDA Plant Hardiness Zone 7b. 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 | 28.7 °F | 44.9 °F | 6.27 in. |
| February | 31.6 °F | 49.0 °F | 5.85 in. |
| March | 38.8 °F | 57.7 °F | 6.43 in. |
| April | 48.0 °F | 67.2 °F | 5.93 in. |
| May | 56.6 °F | 74.6 °F | 5.28 in. |
| June | 63.9 °F | 81.0 °F | 5.58 in. |
| July | 67.0 °F | 84.1 °F | 5.58 in. |
| August | 66.2 °F | 83.5 °F | 4.55 in. |
| September | 60.6 °F | 78.3 °F | 5.37 in. |
| October | 49.6 °F | 67.9 °F | 4.18 in. |
| November | 40.0 °F | 56.9 °F | 5.95 in. |
| December | 32.9 °F | 47.6 °F | 7.52 in. |
| Annual | 48.7 °F | 66.1 °F | 68.49 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 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 |