King William, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 69.7 °F (high). Annual precipitation averages 46.4 Inches. King William is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.2 °F | 48.6 °F | 3.26 in. |
| February | 29.6 °F | 51.9 °F | 2.83 in. |
| March | 36.4 °F | 59.7 °F | 4.03 in. |
| April | 46.0 °F | 70.9 °F | 3.38 in. |
| May | 55.7 °F | 77.7 °F | 3.95 in. |
| June | 64.3 °F | 85.3 °F | 4.27 in. |
| July | 68.6 °F | 89.2 °F | 4.93 in. |
| August | 66.9 °F | 87.2 °F | 4.72 in. |
| September | 60.7 °F | 81.6 °F | 4.48 in. |
| October | 48.4 °F | 71.6 °F | 3.8 in. |
| November | 37.9 °F | 61.0 °F | 3.22 in. |
| December | 31.7 °F | 51.9 °F | 3.51 in. |
| Annual | 47.9 °F | 69.7 °F | 46.38 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |