Brownsville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 65.4 °F (low) to 83.6 °F (high). Annual precipitation averages 28.1 Inches. Brownsville is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 51.0 °F | 70.3 °F | 1.13 in. |
| February | 54.8 °F | 74.4 °F | 1.31 in. |
| March | 60.1 °F | 79.0 °F | 1.34 in. |
| April | 66.1 °F | 83.8 °F | 1.51 in. |
| May | 72.1 °F | 88.5 °F | 2.27 in. |
| June | 75.8 °F | 92.6 °F | 2.66 in. |
| July | 76.5 °F | 93.5 °F | 2.22 in. |
| August | 76.7 °F | 94.9 °F | 2.07 in. |
| September | 73.5 °F | 90.6 °F | 5.62 in. |
| October | 66.8 °F | 85.8 °F | 4.23 in. |
| November | 58.7 °F | 78.3 °F | 1.95 in. |
| December | 52.4 °F | 71.8 °F | 1.83 in. |
| Annual | 65.4 °F | 83.6 °F | 28.14 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |