Big Island, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.1 °C (low) to 20 °C (high). Annual precipitation averages 1286.8 Millimeters. Big Island 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 8.2 °C | 91.44 mm |
| February | -2.7 °C | 10.4 °C | 78.23 mm |
| March | 0.9 °C | 15 °C | 105.41 mm |
| April | 6.2 °C | 20.6 °C | 120.14 mm |
| May | 11.6 °C | 24.5 °C | 125.98 mm |
| June | 16.1 °C | 28.7 °C | 130.81 mm |
| July | 18.3 °C | 30.7 °C | 103.63 mm |
| August | 17.7 °C | 29.6 °C | 91.19 mm |
| September | 13.8 °C | 26.1 °C | 137.41 mm |
| October | 6.9 °C | 20.6 °C | 94.23 mm |
| November | 1.2 °C | 15.3 °C | 100.58 mm |
| December | -2 °C | 10 °C | 107.7 mm |
| Annual | 7.1 °C | 20 °C | 1286.75 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |