Rio Vista, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25.3 °C (high). Annual precipitation averages 970.5 Millimeters. 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 | 1.4 °C | 14.4 °C | 67.56 mm |
| February | 3.5 °C | 16.6 °C | 67.31 mm |
| March | 7.6 °C | 20.6 °C | 89.41 mm |
| April | 11.6 °C | 25.1 °C | 82.55 mm |
| May | 16.9 °C | 29 °C | 115.32 mm |
| June | 21.2 °C | 33.1 °C | 100.58 mm |
| July | 22.8 °C | 35.6 °C | 49.78 mm |
| August | 22.7 °C | 35.7 °C | 68.83 mm |
| September | 18.8 °C | 32.1 °C | 78.23 mm |
| October | 12.8 °C | 26.5 °C | 107.19 mm |
| November | 7 °C | 19.8 °C | 73.66 mm |
| December | 2.4 °C | 15.1 °C | 70.1 mm |
| Annual | 12.4 °C | 25.3 °C | 970.52 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |