Boston, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 19.8 °C (high). Annual precipitation averages 1188.7 Millimeters. Boston is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.7 °C | 8.7 °C | 89.15 mm |
| February | -0.1 °C | 9.8 °C | 77.47 mm |
| March | 3.3 °C | 13.3 °C | 101.85 mm |
| April | 8.6 °C | 19.1 °C | 85.6 mm |
| May | 13.9 °C | 23.8 °C | 91.95 mm |
| June | 18.9 °C | 28.3 °C | 105.16 mm |
| July | 21.7 °C | 30.7 °C | 120.9 mm |
| August | 20.7 °C | 29.6 °C | 116.84 mm |
| September | 17.8 °C | 26.7 °C | 112.27 mm |
| October | 11.7 °C | 21.3 °C | 107.7 mm |
| November | 5.7 °C | 15.4 °C | 80.01 mm |
| December | 1.8 °C | 11 °C | 99.82 mm |
| Annual | 10.3 °C | 19.8 °C | 1188.72 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |