Roan Mountain, Tennessee has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 5 °C (low) to 17.6 °C (high). Annual precipitation averages 1271 Millimeters. Roan Mountain is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 6.8 °C | 113.79 mm |
| February | -3.6 °C | 8.8 °C | 96.77 mm |
| March | -0.5 °C | 12.7 °C | 107.19 mm |
| April | 4.1 °C | 18.1 °C | 111 mm |
| May | 9.1 °C | 22 °C | 109.47 mm |
| June | 13.3 °C | 25.2 °C | 113.54 mm |
| July | 15.3 °C | 26.9 °C | 143 mm |
| August | 14.5 °C | 26.3 °C | 122.17 mm |
| September | 11.1 °C | 23.8 °C | 84.33 mm |
| October | 4.9 °C | 18.7 °C | 70.61 mm |
| November | -0.4 °C | 13.6 °C | 90.42 mm |
| December | -3.1 °C | 8.8 °C | 108.71 mm |
| Annual | 5 °C | 17.6 °C | 1271 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |