| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 4.6" |
| February | 43°F | 66°F | 53°F | 3.4" |
| March | 50°F | 74°F | 61°F | 3.9" |
| April | 57°F | 81°F | 68°F | 3.7" |
| May | 64°F | 86°F | 74°F | 5.5" |
| June | 71°F | 93°F | 81°F | 4.1" |
| July | 73°F | 94°F | 83°F | 3.6" |
| August | 73°F | 96°F | 83°F | 4.1" |
| September | 68°F | 91°F | 78°F | 3.1" |
| October | 57°F | 82°F | 68°F | 4.3" |
| November | 48°F | 72°F | 59°F | 3.8" |
| December | 42°F | 63°F | 51°F | 3.8" |
| Index | Groveton | Texas | National |
| Air quality index | 36 | 52 | 42 |
| Pollution index | 1,202,460 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 326 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Trinity, TX | 2,764 | 52 | 4.0% |
| Westwood Shores, TX | 1,821 | 52 | 4.0% |
| Groveton, TX | 1,150 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Dunnavant, AL | 1,150 | 53 | 6.0% |
| Bethany Beach, DE | 1,150 | 36 | 28.0% |
| Windsor, IL | 1,150 | 40 | 20.0% |
| Cottage City, MD | 1,150 | 47 | 6.0% |
| Mound City, MO | 1,150 | 43 | 14.0% |
| Groveton, TX | 1,150 | 36 | 28.0% |
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