Opal, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.1 °F (low) to 66.7 °F (high). Annual precipitation averages 46.1 Inches. Opal is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.8 °F | 44.4 °F | 3.08 in. |
| February | 25.6 °F | 47.4 °F | 2.67 in. |
| March | 32.3 °F | 55.8 °F | 3.88 in. |
| April | 42.5 °F | 67.2 °F | 3.66 in. |
| May | 52.2 °F | 75.1 °F | 4.57 in. |
| June | 61.0 °F | 83.3 °F | 4.57 in. |
| July | 65.6 °F | 87.6 °F | 4.47 in. |
| August | 63.8 °F | 85.8 °F | 3.72 in. |
| September | 56.7 °F | 79.5 °F | 4.76 in. |
| October | 44.4 °F | 68.5 °F | 3.88 in. |
| November | 34.2 °F | 57.7 °F | 3.22 in. |
| December | 27.6 °F | 48.0 °F | 3.62 in. |
| Annual | 44.1 °F | 66.7 °F | 46.1 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |