Brazoria, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.8 °F (low) to 79.2 °F (high). Annual precipitation averages 50.3 Inches. Brazoria is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.3 °F | 63.8 °F | 3.96 in. |
| February | 48.2 °F | 66.9 °F | 2.68 in. |
| March | 54.1 °F | 72.6 °F | 3.15 in. |
| April | 60.2 °F | 78.3 °F | 3.52 in. |
| May | 68.0 °F | 84.5 °F | 4.24 in. |
| June | 73.4 °F | 89.9 °F | 4.77 in. |
| July | 74.7 °F | 91.7 °F | 4.21 in. |
| August | 74.6 °F | 92.6 °F | 4.82 in. |
| September | 70.6 °F | 89.0 °F | 6.16 in. |
| October | 61.8 °F | 82.4 °F | 4.7 in. |
| November | 52.9 °F | 73.2 °F | 4.12 in. |
| December | 46.2 °F | 66.0 °F | 4.01 in. |
| Annual | 60.8 °F | 79.2 °F | 50.34 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 |