| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 66°F | 54°F | 3.6" |
| February | 46°F | 70°F | 57°F | 2.9" |
| March | 52°F | 76°F | 64°F | 3.6" |
| April | 59°F | 82°F | 70°F | 4.3" |
| May | 66°F | 88°F | 76°F | 5.5" |
| June | 73°F | 94°F | 83°F | 4.6" |
| July | 75°F | 95°F | 84°F | 5.1" |
| August | 75°F | 96°F | 84°F | 7.0" |
| September | 70°F | 92°F | 80°F | 4.2" |
| October | 59°F | 85°F | 71°F | 6.1" |
| November | 51°F | 76°F | 62°F | 3.4" |
| December | 45°F | 67°F | 55°F | 4.1" |
| Index | Barrett | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 99,643 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 26 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beach City, TX | 2,726 | 52 | 4.0% |
| Crosby, TX | 2,276 | 52 | 4.0% |
| Galena Park, TX | 10,848 | 52 | 4.0% |
| Baytown, TX | 76,089 | 52 | 4.0% |
| Highlands, TX | 7,345 | 52 | 4.0% |
| Barrett, TX | 3,389 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Eielson AFB, AK | 3,388 | 38 | 24.0% |
| Rio Dell, CA | 3,388 | 27 | 46.0% |
| Buies Creek, NC | 3,388 | 29 | 42.0% |
| Mayfield, OH | 3,388 | 50 | = 100 |
| Jewett City, CT | 3,387 | 37 | 26.0% |
| Barrett, TX | 3,389 | 52 | 4.0% |
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