Winchester, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 18.2 °C (high). Annual precipitation averages 1030.5 Millimeters. Winchester is located in USDA Plant Hardiness Zone 7a. 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 | -4.8 °C | 5.4 °C | 67.82 mm |
| February | -3.8 °C | 7.3 °C | 57.66 mm |
| March | -0.2 °C | 11.8 °C | 85.85 mm |
| April | 5.2 °C | 18.4 °C | 85.09 mm |
| May | 10.7 °C | 23.1 °C | 104.9 mm |
| June | 15.4 °C | 27.7 °C | 101.85 mm |
| July | 17.9 °C | 30.2 °C | 102.62 mm |
| August | 16.8 °C | 29.3 °C | 84.84 mm |
| September | 12.9 °C | 25.5 °C | 112.52 mm |
| October | 6.6 °C | 19.3 °C | 79.25 mm |
| November | 1.3 °C | 12.8 °C | 71.88 mm |
| December | -2.7 °C | 7.4 °C | 76.2 mm |
| Annual | 6.3 °C | 18.2 °C | 1030.48 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |