The Plains, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.6 °C (low) to 18.5 °C (high). Annual precipitation averages 1151.1 Millimeters. The Plains 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 | -4.4 °C | 6 °C | 81.28 mm |
| February | -3.8 °C | 7.6 °C | 65.28 mm |
| March | 0.1 °C | 12.3 °C | 94.49 mm |
| April | 5.4 °C | 18.7 °C | 87.88 mm |
| May | 10.8 °C | 23.1 °C | 118.62 mm |
| June | 15.4 °C | 27.8 °C | 118.87 mm |
| July | 18.1 °C | 30.1 °C | 111.25 mm |
| August | 17.1 °C | 29.3 °C | 93.98 mm |
| September | 13.3 °C | 25.9 °C | 116.84 mm |
| October | 7.2 °C | 19.7 °C | 92.96 mm |
| November | 1.8 °C | 13.6 °C | 81.53 mm |
| December | -2.1 °C | 8.2 °C | 88.14 mm |
| Annual | 6.6 °C | 18.5 °C | 1151.12 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |