Riesel, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.7 °F (low) to 77.5 °F (high). Annual precipitation averages 38.5 Inches. Riesel 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 | 36.8 °F | 58.5 °F | 2.9 in. |
| February | 40.5 °F | 62.5 °F | 2.76 in. |
| March | 47.6 °F | 69.2 °F | 3.64 in. |
| April | 54.6 °F | 76.5 °F | 3.19 in. |
| May | 63.6 °F | 83.5 °F | 4.55 in. |
| June | 70.8 °F | 90.9 °F | 3.45 in. |
| July | 73.5 °F | 94.7 °F | 1.76 in. |
| August | 73.1 °F | 95.4 °F | 2.42 in. |
| September | 66.7 °F | 89.7 °F | 3.2 in. |
| October | 56.4 °F | 79.9 °F | 4.27 in. |
| November | 46.5 °F | 68.6 °F | 3.07 in. |
| December | 38.7 °F | 60.1 °F | 3.25 in. |
| Annual | 55.7 °F | 77.5 °F | 38.46 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 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |