Westbrook, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.7 °C (low) to 25.3 °C (high). Annual precipitation averages 510 Millimeters. Westbrook is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.7 °C | 14.2 °C | 19.81 mm |
| February | 1.2 °C | 16.7 °C | 22.86 mm |
| March | 5.6 °C | 21.3 °C | 33.02 mm |
| April | 10.3 °C | 26.1 °C | 38.1 mm |
| May | 15.7 °C | 30.5 °C | 65.02 mm |
| June | 19.9 °C | 33.6 °C | 64.52 mm |
| July | 21.9 °C | 35.3 °C | 42.67 mm |
| August | 21.6 °C | 34.8 °C | 51.05 mm |
| September | 17.5 °C | 30.7 °C | 74.93 mm |
| October | 11.3 °C | 25.8 °C | 46.48 mm |
| November | 4.5 °C | 19.3 °C | 29.72 mm |
| December | 0 °C | 14.9 °C | 21.84 mm |
| Annual | 10.7 °C | 25.3 °C | 510.02 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |