Fincastle, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.1 °C (low) to 19.4 °C (high). Annual precipitation averages 1103.4 Millimeters. 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 | -3.4 °C | 7.2 °C | 81.03 mm |
| February | -2.4 °C | 9.4 °C | 69.09 mm |
| March | 0.9 °C | 14.1 °C | 88.14 mm |
| April | 6 °C | 20.3 °C | 93.22 mm |
| May | 11.3 °C | 24.3 °C | 114.05 mm |
| June | 15.8 °C | 28.3 °C | 114.81 mm |
| July | 18.1 °C | 30.2 °C | 106.17 mm |
| August | 17.4 °C | 29.3 °C | 87.63 mm |
| September | 13.8 °C | 25.9 °C | 102.87 mm |
| October | 7.3 °C | 20.4 °C | 77.72 mm |
| November | 1.5 °C | 14.4 °C | 79.25 mm |
| December | -1.7 °C | 8.9 °C | 89.41 mm |
| Annual | 7.1 °C | 19.4 °C | 1103.39 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |