West Lake Hills, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 26.4 °C (high). Annual precipitation averages 939.3 Millimeters. West Lake Hills is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 16.6 °C | 65.53 mm |
| February | 5.7 °C | 18.6 °C | 52.32 mm |
| March | 9.6 °C | 22.4 °C | 74.68 mm |
| April | 13.3 °C | 26.2 °C | 67.82 mm |
| May | 18.3 °C | 29.8 °C | 120.9 mm |
| June | 21.8 °C | 33.3 °C | 91.19 mm |
| July | 23 °C | 35.1 °C | 64.01 mm |
| August | 22.9 °C | 35.7 °C | 64.77 mm |
| September | 20.1 °C | 32.6 °C | 89.92 mm |
| October | 14.6 °C | 27.9 °C | 103.89 mm |
| November | 8.8 °C | 21.6 °C | 72.9 mm |
| December | 4.4 °C | 17.2 °C | 71.37 mm |
| Annual | 13.9 °C | 26.4 °C | 939.3 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |