| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 51°F | 74°F | 61°F | 1.0" |
| February | 56°F | 78°F | 65°F | 0.8" |
| March | 62°F | 84°F | 71°F | 1.0" |
| April | 68°F | 89°F | 77°F | 1.5" |
| May | 73°F | 93°F | 81°F | 2.1" |
| June | 77°F | 97°F | 85°F | 1.8" |
| July | 78°F | 98°F | 86°F | 3.3" |
| August | 78°F | 99°F | 87°F | 1.8" |
| September | 75°F | 95°F | 83°F | 4.6" |
| October | 68°F | 90°F | 78°F | 1.6" |
| November | 60°F | 82°F | 70°F | 1.1" |
| December | 54°F | 75°F | 63°F | 1.4" |
| Index | El Chaparral | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 7,136,530 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 243 |
| Days with moderate air quality | 120 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| El Castillo, TX | 64 | 42 | 16.0% |
| Manuel Garcia, TX | 234 | 42 | 16.0% |
| El Refugio, TX | 512 | 42 | 16.0% |
| Gutierrez, TX | 49 | 42 | 16.0% |
| La Victoria, TX | 76 | 42 | 16.0% |
| El Chaparral, TX | 413 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Chefornak, AK | 413 | 31 | 38.0% |
| Rosston, AR | 413 | 32 | 36.0% |
| Fulton, CA | 413 | 34 | 32.0% |
| June Lake, CA | 413 | 47 | 6.0% |
| Smith Corner, CA | 413 | 67 | 34.0% |
| El Chaparral, TX | 413 | 42 | 16.0% |
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