Potosi, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 76.5 °F (high). Annual precipitation averages 26.8 Inches. Potosi is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.7 °F | 57.0 °F | 1.09 in. |
| February | 35.2 °F | 61.0 °F | 1.56 in. |
| March | 42.9 °F | 68.9 °F | 2.08 in. |
| April | 50.4 °F | 77.1 °F | 2.01 in. |
| May | 60.3 °F | 84.5 °F | 3.32 in. |
| June | 68.3 °F | 91.0 °F | 3.42 in. |
| July | 71.6 °F | 94.7 °F | 2.09 in. |
| August | 71.0 °F | 94.5 °F | 2.53 in. |
| September | 63.6 °F | 87.3 °F | 3.02 in. |
| October | 52.9 °F | 78.1 °F | 2.71 in. |
| November | 41.6 °F | 66.4 °F | 1.62 in. |
| December | 33.5 °F | 58.0 °F | 1.34 in. |
| Annual | 51.9 °F | 76.5 °F | 26.79 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |