Williamsburg, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.2 °F (low) to 67.1 °F (high). Annual precipitation averages 13.3 Inches. Williamsburg is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.3 °F | 47.9 °F | 0.64 in. |
| February | 20.2 °F | 48.9 °F | 0.39 in. |
| March | 27.2 °F | 57.7 °F | 1.06 in. |
| April | 34.1 °F | 64.4 °F | 1.71 in. |
| May | 43.8 °F | 73.3 °F | 2.0 in. |
| June | 53.0 °F | 84.6 °F | 0.94 in. |
| July | 59.0 °F | 89.0 °F | 1.87 in. |
| August | 57.3 °F | 86.4 °F | 1.75 in. |
| September | 48.9 °F | 80.1 °F | 1.22 in. |
| October | 36.4 °F | 68.5 °F | 0.79 in. |
| November | 27.2 °F | 56.2 °F | 0.57 in. |
| December | 19.9 °F | 47.6 °F | 0.32 in. |
| Annual | 37.2 °F | 67.1 °F | 13.26 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |