Martinsville, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.4 °C (low) to 20.3 °C (high). Annual precipitation averages 1198.6 Millimeters. Martinsville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 8.8 °C | 95.25 mm |
| February | -2.1 °C | 10.9 °C | 74.42 mm |
| March | 1.5 °C | 15.3 °C | 104.65 mm |
| April | 6.4 °C | 20.9 °C | 91.19 mm |
| May | 11.7 °C | 24.9 °C | 114.05 mm |
| June | 16.3 °C | 28.9 °C | 116.08 mm |
| July | 18.8 °C | 30.7 °C | 103.38 mm |
| August | 17.9 °C | 29.8 °C | 105.92 mm |
| September | 14.3 °C | 26.4 °C | 134.87 mm |
| October | 7.3 °C | 21.4 °C | 89.92 mm |
| November | 1.5 °C | 15.6 °C | 78.49 mm |
| December | -1.6 °C | 10.5 °C | 90.42 mm |
| Annual | 7.4 °C | 20.3 °C | 1198.64 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |