| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 71°F | 57°F | 0.9" |
| February | 47°F | 76°F | 62°F | 0.4" |
| March | 55°F | 84°F | 70°F | 0.8" |
| April | 62°F | 92°F | 77°F | 0.7" |
| May | 68°F | 96°F | 82°F | 2.5" |
| June | 75°F | 102°F | 88°F | 1.7" |
| July | 76°F | 103°F | 89°F | 1.7" |
| August | 77°F | 104°F | 90°F | 1.3" |
| September | 72°F | 97°F | 84°F | 2.0" |
| October | 63°F | 90°F | 76°F | 0.9" |
| November | 52°F | 79°F | 66°F | 0.5" |
| December | 44°F | 70°F | 57°F | 0.7" |
| Index | El Indio | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 568,521 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 339 |
| Days with good air quality | 287 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Eagle Pass, TX | 29,307 | 25 | 50.0% |
| Eidson Road, TX | 9,334 | 25 | 50.0% |
| Las Quintas Fronterizas, TX | 1,614 | 25 | 50.0% |
| Rosita, TX | 3,483 | 25 | 50.0% |
| El Indio, TX | 0 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| El Indio, TX | 0 | 25 | 50.0% |
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