Buchanan, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 20.1 °C (high). Annual precipitation averages 1118.9 Millimeters. Buchanan is located in USDA Plant Hardiness Zone 7b. 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 | -3.3 °C | 7.9 °C | 81.53 mm |
| February | -2.2 °C | 10.3 °C | 72.14 mm |
| March | 1.2 °C | 15 °C | 100.84 mm |
| April | 6.3 °C | 21.1 °C | 99.31 mm |
| May | 11.4 °C | 25.1 °C | 112.01 mm |
| June | 16.2 °C | 28.9 °C | 108.2 mm |
| July | 18.4 °C | 30.9 °C | 114.3 mm |
| August | 17.8 °C | 30.1 °C | 76.45 mm |
| September | 14.2 °C | 26.5 °C | 102.36 mm |
| October | 7.3 °C | 20.9 °C | 83.06 mm |
| November | 1.5 °C | 15 °C | 82.3 mm |
| December | -1.9 °C | 9.7 °C | 86.36 mm |
| Annual | 7.2 °C | 20.1 °C | 1118.86 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 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 |