Big Wells, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 15.3 °C (low) to 29.1 °C (high). Annual precipitation averages 550.7 Millimeters. Big Wells 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 | 5.3 °C | 19.4 °C | 26.67 mm |
| February | 7.7 °C | 22.1 °C | 21.84 mm |
| March | 11.8 °C | 25.8 °C | 48.01 mm |
| April | 15.3 °C | 29.8 °C | 38.35 mm |
| May | 19.8 °C | 33.2 °C | 84.07 mm |
| June | 22.8 °C | 36.2 °C | 59.44 mm |
| July | 23.5 °C | 37.1 °C | 37.08 mm |
| August | 23.7 °C | 37.4 °C | 46.99 mm |
| September | 21.1 °C | 34.1 °C | 77.98 mm |
| October | 16.1 °C | 30 °C | 52.58 mm |
| November | 10.6 °C | 24 °C | 31.24 mm |
| December | 6.1 °C | 19.9 °C | 26.42 mm |
| Annual | 15.3 °C | 29.1 °C | 550.67 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 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |