Briar, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 24.8 °C (high). Annual precipitation averages 931.2 Millimeters. Briar is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °C | 13.7 °C | 54.36 mm |
| February | 3 °C | 15.7 °C | 62.99 mm |
| March | 7.3 °C | 20.2 °C | 82.04 mm |
| April | 11.5 °C | 24.4 °C | 77.72 mm |
| May | 17 °C | 28.3 °C | 111.76 mm |
| June | 21.5 °C | 33.1 °C | 102.62 mm |
| July | 23.3 °C | 35.2 °C | 55.88 mm |
| August | 23.1 °C | 35.7 °C | 63.75 mm |
| September | 18.9 °C | 31.7 °C | 84.33 mm |
| October | 12.6 °C | 25.8 °C | 104.65 mm |
| November | 6.9 °C | 19.4 °C | 67.31 mm |
| December | 2.2 °C | 14.5 °C | 63.75 mm |
| Annual | 12.4 °C | 24.8 °C | 931.16 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 |