Fincastle, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.6 °F (low) to 68.2 °F (high). Annual precipitation averages 55.2 Inches. Fincastle 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 | 26.3 °F | 45.8 °F | 4.83 in. |
| February | 29.2 °F | 50.4 °F | 4.8 in. |
| March | 35.1 °F | 59.5 °F | 5.46 in. |
| April | 43.7 °F | 69.5 °F | 5.06 in. |
| May | 53.7 °F | 77.5 °F | 4.48 in. |
| June | 61.6 °F | 83.9 °F | 4.84 in. |
| July | 65.6 °F | 86.5 °F | 5.52 in. |
| August | 64.3 °F | 85.8 °F | 4.07 in. |
| September | 57.9 °F | 81.1 °F | 3.7 in. |
| October | 45.3 °F | 70.3 °F | 3.0 in. |
| November | 34.5 °F | 58.7 °F | 4.03 in. |
| December | 29.9 °F | 49.1 °F | 5.45 in. |
| Annual | 45.6 °F | 68.2 °F | 55.24 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |