Colonial Beach, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 68.6 °F (high). Annual precipitation averages 43.9 Inches. Colonial Beach 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 | 28.6 °F | 46.5 °F | 2.97 in. |
| February | 30.2 °F | 49.4 °F | 2.78 in. |
| March | 37.1 °F | 57.2 °F | 3.81 in. |
| April | 46.9 °F | 69.0 °F | 3.1 in. |
| May | 56.7 °F | 76.9 °F | 3.87 in. |
| June | 65.6 °F | 85.2 °F | 4.34 in. |
| July | 70.2 °F | 89.3 °F | 4.38 in. |
| August | 68.6 °F | 87.4 °F | 4.06 in. |
| September | 62.5 °F | 81.4 °F | 4.1 in. |
| October | 50.9 °F | 70.6 °F | 3.69 in. |
| November | 40.1 °F | 59.3 °F | 3.03 in. |
| December | 33.4 °F | 50.5 °F | 3.75 in. |
| Annual | 49.2 °F | 68.6 °F | 43.88 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 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |