Seco Mines, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 59.4 °F (low) to 83.6 °F (high). Annual precipitation averages 19.3 Inches. Seco Mines is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.8 °F | 65.7 °F | 0.8 in. |
| February | 45.4 °F | 70.9 °F | 0.79 in. |
| March | 52.4 °F | 77.9 °F | 1.09 in. |
| April | 59.5 °F | 85.3 °F | 1.14 in. |
| May | 67.8 °F | 91.2 °F | 2.55 in. |
| June | 73.5 °F | 96.5 °F | 2.42 in. |
| July | 74.9 °F | 98.6 °F | 1.65 in. |
| August | 75.1 °F | 99.5 °F | 1.36 in. |
| September | 70.1 °F | 92.5 °F | 3.8 in. |
| October | 60.9 °F | 84.5 °F | 1.75 in. |
| November | 50.5 °F | 73.8 °F | 1.14 in. |
| December | 42.2 °F | 66.3 °F | 0.82 in. |
| Annual | 59.4 °F | 83.6 °F | 19.31 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |