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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 59°F | 47°F | 5.0" |
| February | 41°F | 62°F | 50°F | 4.1" |
| March | 48°F | 71°F | 59°F | 5.9" |
| April | 56°F | 79°F | 66°F | 6.0" |
| May | 63°F | 85°F | 73°F | 4.7" |
| June | 71°F | 92°F | 81°F | 3.8" |
| July | 73°F | 94°F | 82°F | 3.9" |
| August | 73°F | 95°F | 82°F | 4.3" |
| September | 67°F | 90°F | 77°F | 4.2" |
| October | 54°F | 80°F | 66°F | 5.4" |
| November | 46°F | 69°F | 56°F | 4.1" |
| December | 40°F | 61°F | 49°F | 5.5" |
| Index | Brownsville | Louisiana | National |
| Air quality index | 34 | 106 | 42 |
| Pollution index | 4,786,940 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 335 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Calhoun, LA | 265 | 34 | 32.0% |
| Monroe, LA | 47,906 | 34 | 32.0% |
| Swartz, LA | 5,176 | 34 | 32.0% |
| Claiborne, LA | 11,904 | 34 | 32.0% |
| Richwood, LA | 4,778 | 34 | 32.0% |
| Brownsville, LA | 3,718 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Ormstown, QC | 3,717 | n/a | |
| Johnson, AR | 3,719 | 44 | 12.0% |
| Thorndale, PA | 3,719 | 42 | 16.0% |
| Oneida, TN | 3,719 | 40 | 20.0% |
| West Menlo Park, CA | 3,720 | 43 | 14.0% |
| Brownsville, LA | 3,718 | 34 | 32.0% |
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