Tierra Grande, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63 °F (low) to 81.9 °F (high). Annual precipitation averages 30.4 Inches. Tierra Grande is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.7 °F | 67.2 °F | 1.51 in. |
| February | 50.7 °F | 71.3 °F | 1.49 in. |
| March | 57.0 °F | 76.1 °F | 2.16 in. |
| April | 63.3 °F | 81.8 °F | 1.72 in. |
| May | 70.4 °F | 86.8 °F | 3.11 in. |
| June | 74.9 °F | 91.6 °F | 3.15 in. |
| July | 75.9 °F | 93.3 °F | 2.64 in. |
| August | 76.0 °F | 94.5 °F | 2.59 in. |
| September | 72.6 °F | 90.5 °F | 5.28 in. |
| October | 64.7 °F | 84.7 °F | 3.18 in. |
| November | 55.5 °F | 75.8 °F | 1.93 in. |
| December | 48.6 °F | 69.1 °F | 1.66 in. |
| Annual | 63 °F | 81.9 °F | 30.42 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |