Tierra Grande, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.2 °C (low) to 27.7 °C (high). Annual precipitation averages 772.7 Millimeters. Tierra Grande is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.2 °C | 19.6 °C | 38.35 mm |
| February | 10.4 °C | 21.8 °C | 37.85 mm |
| March | 13.9 °C | 24.5 °C | 54.86 mm |
| April | 17.4 °C | 27.7 °C | 43.69 mm |
| May | 21.3 °C | 30.4 °C | 78.99 mm |
| June | 23.8 °C | 33.1 °C | 80.01 mm |
| July | 24.4 °C | 34.1 °C | 67.06 mm |
| August | 24.4 °C | 34.7 °C | 65.79 mm |
| September | 22.6 °C | 32.5 °C | 134.11 mm |
| October | 18.2 °C | 29.3 °C | 80.77 mm |
| November | 13.1 °C | 24.3 °C | 49.02 mm |
| December | 9.2 °C | 20.6 °C | 42.16 mm |
| Annual | 17.2 °C | 27.7 °C | 772.66 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |