Allisonia, Virginia has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.4 °C (low) to 18 °C (high). Annual precipitation averages 1002.3 Millimeters. Allisonia is located in USDA Plant Hardiness Zone 7a. 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 | -4.7 °C | 5.9 °C | 77.47 mm |
| February | -3.6 °C | 8 °C | 63.75 mm |
| March | -0.3 °C | 12.4 °C | 82.8 mm |
| April | 4.4 °C | 18.4 °C | 84.58 mm |
| May | 9.6 °C | 22.9 °C | 100.84 mm |
| June | 14 °C | 26.7 °C | 108.71 mm |
| July | 16.3 °C | 28.5 °C | 106.68 mm |
| August | 15.6 °C | 27.8 °C | 89.41 mm |
| September | 11.8 °C | 24.7 °C | 86.61 mm |
| October | 5.3 °C | 19.2 °C | 62.74 mm |
| November | -0.1 °C | 13.2 °C | 65.79 mm |
| December | -3.1 °C | 7.7 °C | 72.9 mm |
| Annual | 5.4 °C | 18 °C | 1002.28 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |