Coalmont, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 18.9 °C (high). Annual precipitation averages 1644.4 Millimeters. Coalmont 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 | -2.8 °C | 7.3 °C | 138.18 mm |
| February | -1.4 °C | 9.4 °C | 142.75 mm |
| March | 2.4 °C | 14.1 °C | 156.97 mm |
| April | 6.8 °C | 19.3 °C | 158.24 mm |
| May | 11.9 °C | 23.2 °C | 131.32 mm |
| June | 16.2 °C | 26.9 °C | 138.18 mm |
| July | 18.1 °C | 28.6 °C | 156.72 mm |
| August | 17.3 °C | 28.4 °C | 120.65 mm |
| September | 13.8 °C | 25.8 °C | 113.03 mm |
| October | 7.4 °C | 20.2 °C | 94.23 mm |
| November | 2.2 °C | 14.1 °C | 121.67 mm |
| December | -1.1 °C | 8.9 °C | 172.47 mm |
| Annual | 7.6 °C | 18.9 °C | 1644.41 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |