Pearsall, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 14.5 °C (low) to 28.3 °C (high). Annual precipitation averages 609.6 Millimeters. Pearsall is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °C | 18.8 °C | 31.75 mm |
| February | 6.8 °C | 21.2 °C | 30.73 mm |
| March | 10.8 °C | 24.9 °C | 51.82 mm |
| April | 14.3 °C | 28.5 °C | 42.67 mm |
| May | 18.9 °C | 31.9 °C | 82.3 mm |
| June | 22 °C | 35.1 °C | 68.33 mm |
| July | 22.8 °C | 36.4 °C | 42.42 mm |
| August | 22.8 °C | 36.9 °C | 45.72 mm |
| September | 20.3 °C | 33.6 °C | 86.87 mm |
| October | 15.3 °C | 29.6 °C | 58.42 mm |
| November | 9.9 °C | 23.5 °C | 38.35 mm |
| December | 5.6 °C | 19.4 °C | 30.23 mm |
| Annual | 14.5 °C | 28.3 °C | 609.61 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |