Fairmount, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 18.9 °C (high). Annual precipitation averages 1739.6 Millimeters. 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 | -1.8 °C | 7.2 °C | 159.26 mm |
| February | -0.2 °C | 9.4 °C | 148.59 mm |
| March | 3.8 °C | 14.3 °C | 163.32 mm |
| April | 8.9 °C | 19.6 °C | 150.62 mm |
| May | 13.7 °C | 23.7 °C | 134.11 mm |
| June | 17.7 °C | 27.2 °C | 141.73 mm |
| July | 19.4 °C | 28.9 °C | 141.73 mm |
| August | 19 °C | 28.6 °C | 115.57 mm |
| September | 15.9 °C | 25.7 °C | 136.4 mm |
| October | 9.8 °C | 19.9 °C | 106.17 mm |
| November | 4.4 °C | 13.8 °C | 151.13 mm |
| December | 0.5 °C | 8.7 °C | 191.01 mm |
| Annual | 9.3 °C | 18.9 °C | 1739.64 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |