Bull Run, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 19.2 °C (high). Annual precipitation averages 1073.7 Millimeters. Bull Run 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 6.4 °C | 72.14 mm |
| February | -3.3 °C | 8.2 °C | 62.74 mm |
| March | 0.6 °C | 12.9 °C | 88.39 mm |
| April | 6.2 °C | 19.5 °C | 75.95 mm |
| May | 11.7 °C | 23.9 °C | 104.39 mm |
| June | 16.8 °C | 28.8 °C | 110.74 mm |
| July | 19.4 °C | 31.2 °C | 101.85 mm |
| August | 18.3 °C | 30.2 °C | 93.47 mm |
| September | 14.6 °C | 26.6 °C | 108.71 mm |
| October | 7.6 °C | 20.2 °C | 90.17 mm |
| November | 1.7 °C | 14.1 °C | 79.5 mm |
| December | -1.8 °C | 8.6 °C | 85.6 mm |
| Annual | 7.3 °C | 19.2 °C | 1073.65 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |