Seco Mines, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 15.2 °C (low) to 28.6 °C (high). Annual precipitation averages 490.5 Millimeters. Seco Mines is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °C | 18.7 °C | 20.32 mm |
| February | 7.4 °C | 21.6 °C | 20.07 mm |
| March | 11.3 °C | 25.5 °C | 27.69 mm |
| April | 15.3 °C | 29.6 °C | 28.96 mm |
| May | 19.9 °C | 32.9 °C | 64.77 mm |
| June | 23.1 °C | 35.8 °C | 61.47 mm |
| July | 23.8 °C | 37 °C | 41.91 mm |
| August | 23.9 °C | 37.5 °C | 34.54 mm |
| September | 21.2 °C | 33.6 °C | 96.52 mm |
| October | 16.1 °C | 29.2 °C | 44.45 mm |
| November | 10.3 °C | 23.2 °C | 28.96 mm |
| December | 5.7 °C | 19.1 °C | 20.83 mm |
| Annual | 15.2 °C | 28.6 °C | 490.49 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| 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 |