Calverton, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 19.5 °C (high). Annual precipitation averages 1141.5 Millimeters. Calverton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 6.9 °C | 75.95 mm |
| February | -3.4 °C | 8.7 °C | 67.06 mm |
| March | 0.6 °C | 13.4 °C | 97.28 mm |
| April | 6.2 °C | 19.9 °C | 88.65 mm |
| May | 11.8 °C | 24.3 °C | 110.49 mm |
| June | 16.7 °C | 28.9 °C | 114.55 mm |
| July | 19.3 °C | 31.3 °C | 108.46 mm |
| August | 18.3 °C | 30.3 °C | 90.68 mm |
| September | 14.3 °C | 26.7 °C | 118.62 mm |
| October | 7.1 °C | 20.5 °C | 97.28 mm |
| November | 1.4 °C | 14.4 °C | 82.55 mm |
| December | -2.1 °C | 8.9 °C | 89.92 mm |
| Annual | 7.2 °C | 19.5 °C | 1141.49 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |