Rio Vista, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.3 °F (low) to 77.5 °F (high). Annual precipitation averages 38.2 Inches. Rio Vista is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.5 °F | 57.9 °F | 2.66 in. |
| February | 38.3 °F | 61.8 °F | 2.65 in. |
| March | 45.6 °F | 69.0 °F | 3.52 in. |
| April | 52.9 °F | 77.1 °F | 3.25 in. |
| May | 62.5 °F | 84.2 °F | 4.54 in. |
| June | 70.2 °F | 91.5 °F | 3.96 in. |
| July | 73.1 °F | 96.0 °F | 1.96 in. |
| August | 72.8 °F | 96.3 °F | 2.71 in. |
| September | 65.8 °F | 89.7 °F | 3.08 in. |
| October | 55.0 °F | 79.7 °F | 4.22 in. |
| November | 44.6 °F | 67.6 °F | 2.9 in. |
| December | 36.3 °F | 59.2 °F | 2.76 in. |
| Annual | 54.3 °F | 77.5 °F | 38.21 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |