Blackstone, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 20.4 °C (high). Annual precipitation averages 1195.8 Millimeters. Blackstone 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 | -2.6 °C | 8.9 °C | 88.14 mm |
| February | -1.8 °C | 10.9 °C | 70.36 mm |
| March | 1.8 °C | 15.2 °C | 104.9 mm |
| April | 7.4 °C | 20.9 °C | 91.19 mm |
| May | 12.6 °C | 24.8 °C | 102.62 mm |
| June | 17.4 °C | 29.1 °C | 121.16 mm |
| July | 19.7 °C | 31.1 °C | 116.33 mm |
| August | 18.9 °C | 30.2 °C | 113.54 mm |
| September | 15.3 °C | 26.8 °C | 118.87 mm |
| October | 8.3 °C | 21.1 °C | 96.27 mm |
| November | 2.6 °C | 15.6 °C | 82.04 mm |
| December | -0.7 °C | 10.7 °C | 90.42 mm |
| Annual | 8.2 °C | 20.4 °C | 1195.84 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |