Balmorhea, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9.6 °C (low) to 26.5 °C (high). Annual precipitation averages 320.3 Millimeters. Balmorhea 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 | -0.8 °C | 15.9 °C | 14.99 mm |
| February | 1.1 °C | 18.8 °C | 12.45 mm |
| March | 4.5 °C | 23.1 °C | 9.4 mm |
| April | 8.8 °C | 27.8 °C | 12.45 mm |
| May | 14.1 °C | 31.8 °C | 26.92 mm |
| June | 18.8 °C | 35.6 °C | 30.99 mm |
| July | 20.2 °C | 35.2 °C | 46.99 mm |
| August | 19.6 °C | 34.7 °C | 57.66 mm |
| September | 16 °C | 30.9 °C | 55.12 mm |
| October | 9.9 °C | 27 °C | 25.4 mm |
| November | 3.4 °C | 20.9 °C | 13.72 mm |
| December | -0.5 °C | 16.3 °C | 14.22 mm |
| Annual | 9.6 °C | 26.5 °C | 320.31 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 | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |