| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 74°F | 61°F | 1.4" |
| February | 54°F | 77°F | 65°F | 1.1" |
| March | 60°F | 81°F | 69°F | 1.5" |
| April | 66°F | 87°F | 75°F | 1.2" |
| May | 71°F | 90°F | 80°F | 2.6" |
| June | 75°F | 94°F | 84°F | 2.2" |
| July | 76°F | 94°F | 84°F | 4.1" |
| August | 77°F | 96°F | 85°F | 1.7" |
| September | 73°F | 92°F | 81°F | 7.1" |
| October | 66°F | 88°F | 76°F | 3.4" |
| November | 59°F | 82°F | 70°F | 1.9" |
| December | 53°F | 76°F | 63°F | 1.7" |
| Index | Brownsville | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 7,136,530 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 129 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Olmito, TX | 1,255 | 44 | 12.0% |
| Villa Pancho, TX | 378 | 44 | 12.0% |
| Indian Lake, TX | 960 | 44 | 12.0% |
| La Paloma, TX | 4,140 | 44 | 12.0% |
| Orason, TX | 555 | 44 | 12.0% |
| Brownsville, TX | 182,230 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort Lauderdale, FL | 181,818 | 41 | 18.0% |
| Vancouver, WA | 182,792 | 38 | 24.0% |
| Chattanooga, TN | 181,370 | 46 | 8.0% |
| Sioux Falls, SD | 180,927 | 36 | 28.0% |
| Newport News, VA | 179,582 | 40 | 20.0% |
| Brownsville, TX | 182,230 | 44 | 12.0% |
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