Lago Vista, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.3 °F (low) to 78.8 °F (high). Annual precipitation averages 34.3 Inches. Lago Vista is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.7 °F | 61.0 °F | 2.22 in. |
| February | 40.4 °F | 64.3 °F | 2.01 in. |
| March | 47.3 °F | 71.4 °F | 2.89 in. |
| April | 54.4 °F | 78.7 °F | 2.58 in. |
| May | 63.4 °F | 85.0 °F | 4.36 in. |
| June | 69.9 °F | 91.5 °F | 3.23 in. |
| July | 72.0 °F | 95.1 °F | 2.23 in. |
| August | 71.7 °F | 96.2 °F | 2.47 in. |
| September | 66.6 °F | 89.9 °F | 3.37 in. |
| October | 56.5 °F | 81.1 °F | 3.69 in. |
| November | 46.2 °F | 69.8 °F | 2.85 in. |
| December | 38.1 °F | 62.0 °F | 2.36 in. |
| Annual | 55.3 °F | 78.8 °F | 34.26 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |