Rowlett, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.7 °F (low) to 76 °F (high). Annual precipitation averages 41.8 Inches. Rowlett 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 55.7 °F | 2.66 in. |
| February | 38.4 °F | 59.9 °F | 2.97 in. |
| March | 45.8 °F | 67.2 °F | 3.65 in. |
| April | 53.3 °F | 75.0 °F | 3.58 in. |
| May | 62.8 °F | 82.3 °F | 5.18 in. |
| June | 70.8 °F | 90.5 °F | 4.02 in. |
| July | 73.7 °F | 94.5 °F | 2.27 in. |
| August | 73.2 °F | 95.1 °F | 2.38 in. |
| September | 66.5 °F | 88.5 °F | 3.23 in. |
| October | 55.0 °F | 78.4 °F | 4.88 in. |
| November | 44.8 °F | 66.7 °F | 3.22 in. |
| December | 36.8 °F | 57.7 °F | 3.73 in. |
| Annual | 54.7 °F | 76 °F | 41.77 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 |