Rio, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.2 °F (low) to 67.3 °F (high). Annual precipitation averages 46.1 Inches. Rio 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.4 °F | 45.6 °F | 3.22 in. |
| February | 27.2 °F | 49.0 °F | 2.8 in. |
| March | 33.7 °F | 57.2 °F | 3.88 in. |
| April | 43.5 °F | 68.7 °F | 3.47 in. |
| May | 53.0 °F | 75.6 °F | 4.47 in. |
| June | 61.8 °F | 83.3 °F | 4.43 in. |
| July | 65.8 °F | 87.3 °F | 4.23 in. |
| August | 64.3 °F | 85.6 °F | 3.85 in. |
| September | 57.7 °F | 79.2 °F | 4.78 in. |
| October | 45.7 °F | 69.1 °F | 3.85 in. |
| November | 35.4 °F | 58.5 °F | 3.49 in. |
| December | 29.0 °F | 48.9 °F | 3.59 in. |
| Annual | 45.2 °F | 67.3 °F | 46.06 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |