Keysville, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 20.1 °C (high). Annual precipitation averages 1155.2 Millimeters. Keysville 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.9 °C | 8.3 °C | 86.11 mm |
| February | -1.9 °C | 10.4 °C | 64.77 mm |
| March | 1.6 °C | 14.7 °C | 102.11 mm |
| April | 6.9 °C | 20.5 °C | 87.12 mm |
| May | 12 °C | 24.5 °C | 111.51 mm |
| June | 16.8 °C | 28.9 °C | 97.28 mm |
| July | 19.2 °C | 30.9 °C | 112.78 mm |
| August | 18.4 °C | 30 °C | 99.57 mm |
| September | 14.9 °C | 26.6 °C | 119.63 mm |
| October | 8 °C | 20.9 °C | 98.55 mm |
| November | 2.2 °C | 15 °C | 85.34 mm |
| December | -0.8 °C | 10.1 °C | 90.42 mm |
| Annual | 7.9 °C | 20.1 °C | 1155.19 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 |