Williamsburg, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7 °C (low) to 20 °C (high). Annual precipitation averages 1355.1 Millimeters. Williamsburg 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 | -3.8 °C | 7.6 °C | 113.54 mm |
| February | -2.3 °C | 9.9 °C | 108.46 mm |
| March | 0.9 °C | 15 °C | 133.35 mm |
| April | 5.7 °C | 21 °C | 120.65 mm |
| May | 11.6 °C | 25.2 °C | 118.62 mm |
| June | 16.1 °C | 29.1 °C | 118.62 mm |
| July | 18.3 °C | 30.2 °C | 136.91 mm |
| August | 17.4 °C | 29.6 °C | 113.79 mm |
| September | 13.7 °C | 26.6 °C | 97.79 mm |
| October | 6.7 °C | 20.9 °C | 80.01 mm |
| November | 0.9 °C | 14.7 °C | 82.55 mm |
| December | -1.6 °C | 9.7 °C | 130.81 mm |
| Annual | 7 °C | 20 °C | 1355.1 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |