Ralls, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.1 °C (low) to 23.4 °C (high). Annual precipitation averages 518.7 Millimeters. Ralls is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 12.4 °C | 18.29 mm |
| February | -1.6 °C | 14.8 °C | 20.32 mm |
| March | 2.6 °C | 19.3 °C | 32.26 mm |
| April | 6.9 °C | 23.9 °C | 41.4 mm |
| May | 12.8 °C | 28.2 °C | 70.36 mm |
| June | 17.8 °C | 32.2 °C | 75.44 mm |
| July | 19.7 °C | 33.7 °C | 55.88 mm |
| August | 19 °C | 33.3 °C | 53.59 mm |
| September | 14.9 °C | 29.2 °C | 66.29 mm |
| October | 8.6 °C | 24 °C | 39.88 mm |
| November | 2.1 °C | 17.6 °C | 25.15 mm |
| December | -2.3 °C | 12.7 °C | 19.81 mm |
| Annual | 8.1 °C | 23.4 °C | 518.67 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |