Wilmer, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.8 °F (low) to 76.6 °F (high). Annual precipitation averages 40.5 Inches. Wilmer 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 | 35.1 °F | 56.2 °F | 2.95 in. |
| February | 38.8 °F | 60.6 °F | 2.88 in. |
| March | 46.0 °F | 67.6 °F | 3.64 in. |
| April | 53.3 °F | 75.5 °F | 3.87 in. |
| May | 63.0 °F | 83.0 °F | 4.6 in. |
| June | 70.8 °F | 91.0 °F | 3.89 in. |
| July | 73.7 °F | 95.4 °F | 2.0 in. |
| August | 73.4 °F | 96.1 °F | 2.53 in. |
| September | 66.6 °F | 89.5 °F | 2.87 in. |
| October | 55.2 °F | 79.1 °F | 4.8 in. |
| November | 45.0 °F | 67.1 °F | 3.0 in. |
| December | 37.0 °F | 58.1 °F | 3.49 in. |
| Annual | 54.8 °F | 76.6 °F | 40.52 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 |