Williamsburg, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 18 °C (high). Annual precipitation averages 1170.4 Millimeters. Williamsburg is located in USDA Plant Hardiness Zone 6b. 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 | -5.1 °C | 4.1 °C | 78.99 mm |
| February | -3.6 °C | 6.4 °C | 77.98 mm |
| March | 0.4 °C | 11.7 °C | 111.51 mm |
| April | 6 °C | 18.4 °C | 121.67 mm |
| May | 11.8 °C | 23.4 °C | 120.65 mm |
| June | 16.7 °C | 28.1 °C | 117.86 mm |
| July | 18.5 °C | 29.8 °C | 119.38 mm |
| August | 17.6 °C | 29.3 °C | 100.33 mm |
| September | 13.4 °C | 26.1 °C | 77.47 mm |
| October | 7.2 °C | 19.6 °C | 73.15 mm |
| November | 1.4 °C | 12.3 °C | 83.06 mm |
| December | -2.1 °C | 6.3 °C | 88.39 mm |
| Annual | 6.9 °C | 18 °C | 1170.44 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |