Kopperl, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.7 °F (low) to 78.1 °F (high). Annual precipitation averages 36.7 Inches. Kopperl is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.6 °F | 58.3 °F | 2.49 in. |
| February | 38.5 °F | 62.4 °F | 2.48 in. |
| March | 46.0 °F | 69.5 °F | 3.22 in. |
| April | 53.6 °F | 77.4 °F | 3.27 in. |
| May | 63.0 °F | 84.8 °F | 4.43 in. |
| June | 70.6 °F | 92.2 °F | 3.92 in. |
| July | 73.6 °F | 96.7 °F | 1.91 in. |
| August | 73.2 °F | 97.3 °F | 2.4 in. |
| September | 66.3 °F | 90.6 °F | 3.06 in. |
| October | 55.2 °F | 80.4 °F | 4.01 in. |
| November | 44.8 °F | 68.2 °F | 2.78 in. |
| December | 36.6 °F | 59.9 °F | 2.71 in. |
| Annual | 54.7 °F | 78.1 °F | 36.68 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |