Groom, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44 °F (low) to 71.6 °F (high). Annual precipitation averages 22.3 Inches. Groom is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.7 °F | 50.6 °F | 0.7 in. |
| February | 26.0 °F | 54.3 °F | 0.61 in. |
| March | 33.7 °F | 63.2 °F | 1.4 in. |
| April | 41.7 °F | 71.4 °F | 1.84 in. |
| May | 52.0 °F | 79.7 °F | 2.9 in. |
| June | 61.9 °F | 88.5 °F | 3.24 in. |
| July | 65.7 °F | 92.5 °F | 2.6 in. |
| August | 64.4 °F | 91.0 °F | 3.07 in. |
| September | 56.9 °F | 83.5 °F | 2.1 in. |
| October | 44.6 °F | 72.7 °F | 2.09 in. |
| November | 32.6 °F | 60.7 °F | 0.85 in. |
| December | 24.6 °F | 50.8 °F | 0.86 in. |
| Annual | 44 °F | 71.6 °F | 22.26 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |