Pecos, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 9.9 °C (low) to 27.6 °C (high). Annual precipitation averages 285.8 Millimeters. Pecos is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.3 °C | 16.1 °C | 13.97 mm |
| February | 0.8 °C | 19.3 °C | 11.43 mm |
| March | 4.4 °C | 23.9 °C | 10.16 mm |
| April | 8.9 °C | 28.8 °C | 12.19 mm |
| May | 14.6 °C | 33.2 °C | 25.4 mm |
| June | 19.8 °C | 37.3 °C | 28.45 mm |
| July | 21.4 °C | 37.1 °C | 45.47 mm |
| August | 20.9 °C | 36.7 °C | 40.39 mm |
| September | 16.8 °C | 32.7 °C | 48.01 mm |
| October | 10.2 °C | 28.1 °C | 23.37 mm |
| November | 3 °C | 21.3 °C | 12.19 mm |
| December | -0.8 °C | 16.3 °C | 14.73 mm |
| Annual | 9.9 °C | 27.6 °C | 285.76 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | BSh - Hot Semi-Arid Climate |