Fincastle, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.7 °F (low) to 66.9 °F (high). Annual precipitation averages 43.4 Inches. Fincastle is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.9 °F | 45.0 °F | 3.19 in. |
| February | 27.7 °F | 48.9 °F | 2.72 in. |
| March | 33.6 °F | 57.4 °F | 3.47 in. |
| April | 42.8 °F | 68.5 °F | 3.67 in. |
| May | 52.3 °F | 75.8 °F | 4.49 in. |
| June | 60.5 °F | 82.9 °F | 4.52 in. |
| July | 64.5 °F | 86.3 °F | 4.18 in. |
| August | 63.3 °F | 84.7 °F | 3.45 in. |
| September | 56.9 °F | 78.7 °F | 4.05 in. |
| October | 45.1 °F | 68.7 °F | 3.06 in. |
| November | 34.7 °F | 57.9 °F | 3.12 in. |
| December | 28.9 °F | 48.1 °F | 3.52 in. |
| Annual | 44.7 °F | 66.9 °F | 43.44 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |