Colonial Beach, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 20.3 °C (high). Annual precipitation averages 1114.6 Millimeters. 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 | -1.9 °C | 8.1 °C | 75.44 mm |
| February | -1 °C | 9.7 °C | 70.61 mm |
| March | 2.8 °C | 14 °C | 96.77 mm |
| April | 8.3 °C | 20.6 °C | 78.74 mm |
| May | 13.7 °C | 24.9 °C | 98.3 mm |
| June | 18.7 °C | 29.6 °C | 110.24 mm |
| July | 21.2 °C | 31.8 °C | 111.25 mm |
| August | 20.3 °C | 30.8 °C | 103.12 mm |
| September | 16.9 °C | 27.4 °C | 104.14 mm |
| October | 10.5 °C | 21.4 °C | 93.73 mm |
| November | 4.5 °C | 15.2 °C | 76.96 mm |
| December | 0.8 °C | 10.3 °C | 95.25 mm |
| Annual | 9.6 °C | 20.3 °C | 1114.55 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |