Union Level, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 21 °C (high). Annual precipitation averages 1152.4 Millimeters. Union Level is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 9.4 °C | 86.87 mm |
| February | -1.3 °C | 11.4 °C | 68.58 mm |
| March | 2.2 °C | 15.6 °C | 102.11 mm |
| April | 7.6 °C | 21.4 °C | 86.61 mm |
| May | 12.9 °C | 25.4 °C | 98.04 mm |
| June | 17.6 °C | 29.8 °C | 111.76 mm |
| July | 19.9 °C | 31.8 °C | 119.63 mm |
| August | 19.2 °C | 30.8 °C | 101.35 mm |
| September | 15.7 °C | 27.5 °C | 117.35 mm |
| October | 8.6 °C | 21.8 °C | 89.92 mm |
| November | 2.7 °C | 15.9 °C | 81.28 mm |
| December | -0.3 °C | 11.3 °C | 88.9 mm |
| Annual | 8.5 °C | 21 °C | 1152.4 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |