Williamsburg, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 21.1 °C (high). Annual precipitation averages 1269 Millimeters. Williamsburg is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.7 °C | 9.7 °C | 91.69 mm |
| February | 0.1 °C | 11.4 °C | 72.39 mm |
| March | 3.7 °C | 15.4 °C | 103.12 mm |
| April | 9.2 °C | 21.2 °C | 96.01 mm |
| May | 14.5 °C | 25.2 °C | 101.85 mm |
| June | 19.3 °C | 29.4 °C | 111.76 mm |
| July | 21.6 °C | 31.9 °C | 137.92 mm |
| August | 20.9 °C | 30.6 °C | 144.02 mm |
| September | 17.6 °C | 27.7 °C | 130.81 mm |
| October | 11.1 °C | 22.1 °C | 109.73 mm |
| November | 5.3 °C | 16.6 °C | 77.22 mm |
| December | 1.3 °C | 11.9 °C | 92.46 mm |
| Annual | 10.3 °C | 21.1 °C | 1268.98 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |