Windsor, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 21.5 °C (high). Annual precipitation averages 1277.4 Millimeters. Windsor is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.3 °C | 10.4 °C | 93.47 mm |
| February | -0.4 °C | 12.1 °C | 71.63 mm |
| March | 3.2 °C | 15.9 °C | 102.11 mm |
| April | 8.5 °C | 21.6 °C | 92.96 mm |
| May | 13.6 °C | 25.6 °C | 100.84 mm |
| June | 18.2 °C | 29.8 °C | 118.11 mm |
| July | 20.7 °C | 31.8 °C | 134.62 mm |
| August | 19.8 °C | 30.9 °C | 144.27 mm |
| September | 16.7 °C | 27.9 °C | 138.94 mm |
| October | 10.1 °C | 22.7 °C | 103.89 mm |
| November | 4 °C | 17.1 °C | 85.09 mm |
| December | 0.6 °C | 12.4 °C | 91.44 mm |
| Annual | 9.5 °C | 21.5 °C | 1277.37 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |