Rosenberg, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.7 °F (low) to 79.8 °F (high). Annual precipitation averages 52 Inches. Rosenberg is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.2 °F | 63.1 °F | 3.94 in. |
| February | 47.0 °F | 66.8 °F | 2.94 in. |
| March | 53.1 °F | 73.2 °F | 3.53 in. |
| April | 59.1 °F | 79.4 °F | 4.11 in. |
| May | 67.0 °F | 85.9 °F | 4.96 in. |
| June | 72.6 °F | 91.2 °F | 5.2 in. |
| July | 73.9 °F | 93.1 °F | 3.88 in. |
| August | 73.9 °F | 94.4 °F | 5.2 in. |
| September | 69.7 °F | 90.0 °F | 4.91 in. |
| October | 60.4 °F | 82.7 °F | 4.57 in. |
| November | 51.2 °F | 72.7 °F | 4.56 in. |
| December | 44.8 °F | 65.2 °F | 4.17 in. |
| Annual | 59.7 °F | 79.8 °F | 51.97 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |