Galveston, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 65.7 °F (low) to 75.7 °F (high). Annual precipitation averages 51.8 Inches. Galveston is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 48.7 °F | 61.1 °F | 4.52 in. |
| February | 52.0 °F | 63.4 °F | 3.08 in. |
| March | 58.3 °F | 68.6 °F | 3.33 in. |
| April | 65.0 °F | 74.2 °F | 3.89 in. |
| May | 72.5 °F | 80.5 °F | 3.36 in. |
| June | 78.0 °F | 85.9 °F | 4.37 in. |
| July | 80.0 °F | 87.9 °F | 3.96 in. |
| August | 79.6 °F | 88.5 °F | 5.38 in. |
| September | 76.2 °F | 85.6 °F | 6.48 in. |
| October | 69.0 °F | 78.9 °F | 4.83 in. |
| November | 58.7 °F | 70.2 °F | 4.41 in. |
| December | 50.8 °F | 63.2 °F | 4.21 in. |
| Annual | 65.7 °F | 75.7 °F | 51.82 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |