Middleburg, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.7 °C (low) to 18.7 °C (high). Annual precipitation averages 1125.2 Millimeters. Middleburg 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 | -4.5 °C | 5.8 °C | 78.74 mm |
| February | -3.7 °C | 7.6 °C | 63.5 mm |
| March | 0.1 °C | 12.3 °C | 93.73 mm |
| April | 5.4 °C | 19 °C | 86.87 mm |
| May | 10.8 °C | 23.4 °C | 116.84 mm |
| June | 15.9 °C | 28.2 °C | 113.03 mm |
| July | 18.5 °C | 30.6 °C | 108.46 mm |
| August | 17.4 °C | 29.8 °C | 90.42 mm |
| September | 13.7 °C | 26.3 °C | 114.05 mm |
| October | 7 °C | 20 °C | 91.69 mm |
| November | 1.6 °C | 13.6 °C | 79.76 mm |
| December | -2.2 °C | 8.1 °C | 88.14 mm |
| Annual | 6.7 °C | 18.7 °C | 1125.23 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 |