Rockport, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 65.6 °F (low) to 78.2 °F (high). Annual precipitation averages 35.9 Inches. Rockport is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 48.7 °F | 63.9 °F | 2.53 in. |
| February | 52.4 °F | 66.8 °F | 1.9 in. |
| March | 58.6 °F | 71.6 °F | 2.48 in. |
| April | 65.2 °F | 77.3 °F | 1.98 in. |
| May | 72.5 °F | 82.5 °F | 3.4 in. |
| June | 77.9 °F | 87.5 °F | 3.79 in. |
| July | 79.2 °F | 88.8 °F | 2.97 in. |
| August | 78.6 °F | 90.0 °F | 2.53 in. |
| September | 75.2 °F | 87.9 °F | 5.54 in. |
| October | 68.8 °F | 81.8 °F | 3.77 in. |
| November | 58.8 °F | 73.3 °F | 3.05 in. |
| December | 51.0 °F | 66.4 °F | 1.97 in. |
| Annual | 65.6 °F | 78.2 °F | 35.91 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 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |