Leesburg, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7 °C (low) to 18.9 °C (high). Annual precipitation averages 1093.2 Millimeters. Leesburg 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.4 °C | 5.8 °C | 76.71 mm |
| February | -3.4 °C | 7.6 °C | 61.72 mm |
| March | 0.4 °C | 12.3 °C | 92.2 mm |
| April | 5.9 °C | 19 °C | 85.6 mm |
| May | 11.4 °C | 23.8 °C | 113.79 mm |
| June | 16.3 °C | 28.4 °C | 103.63 mm |
| July | 19 °C | 31.1 °C | 103.12 mm |
| August | 18.1 °C | 30.2 °C | 83.31 mm |
| September | 14.1 °C | 26.4 °C | 115.82 mm |
| October | 7.2 °C | 20.1 °C | 89.66 mm |
| November | 1.6 °C | 13.6 °C | 77.47 mm |
| December | -2.2 °C | 7.9 °C | 90.17 mm |
| Annual | 7 °C | 18.9 °C | 1093.2 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 7b : -15°C to -12.2°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 |