Blairs, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 20.8 °C (high). Annual precipitation averages 1180.3 Millimeters. Blairs 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 | -2.4 °C | 9.3 °C | 95 mm |
| February | -1.3 °C | 11.3 °C | 73.66 mm |
| March | 2.4 °C | 15.8 °C | 102.36 mm |
| April | 7.4 °C | 21.3 °C | 99.06 mm |
| May | 12.6 °C | 25.2 °C | 108.71 mm |
| June | 17.2 °C | 29.3 °C | 105.92 mm |
| July | 19.6 °C | 31.2 °C | 110.74 mm |
| August | 18.8 °C | 30.3 °C | 99.31 mm |
| September | 15.2 °C | 26.9 °C | 116.84 mm |
| October | 8.2 °C | 21.6 °C | 90.93 mm |
| November | 2.2 °C | 15.9 °C | 89.92 mm |
| December | -0.8 °C | 10.9 °C | 87.88 mm |
| Annual | 8.3 °C | 20.8 °C | 1180.33 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |