| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 58°F | 44°F | 2.9" |
| February | 38°F | 61°F | 48°F | 1.9" |
| March | 47°F | 70°F | 57°F | 3.9" |
| April | 54°F | 77°F | 65°F | 4.2" |
| May | 62°F | 83°F | 72°F | 4.7" |
| June | 71°F | 92°F | 81°F | 3.4" |
| July | 73°F | 96°F | 84°F | 2.7" |
| August | 74°F | 96°F | 84°F | 2.1" |
| September | 66°F | 90°F | 77°F | 2.9" |
| October | 54°F | 80°F | 66°F | 4.6" |
| November | 45°F | 68°F | 56°F | 3.5" |
| December | 36°F | 58°F | 46°F | 3.1" |
| Index | Trenton | Texas | National |
| Air quality index | 325 | 52 | 42 |
| Pollution index | 723,856 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 138 |
| Days with good air quality | 120 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Melissa, TX | 11,030 | 51 | 2.0% |
| New Hope, TX | 616 | 51 | 2.0% |
| Blue Ridge, TX | 861 | 51 | 2.0% |
| Anna, TX | 14,625 | 51 | 2.0% |
| Westminster, TX | 786 | 51 | 2.0% |
| Trenton, TX | 688 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Grimes, AL | 688 | 35 | 30.0% |
| Geyserville, CA | 688 | 34 | 32.0% |
| Bedford Park, IL | 688 | 55 | 10.0% |
| Bradford, IL | 688 | 41 | 18.0% |
| Grafton, IL | 688 | 54 | 8.0% |
| Trenton, TX | 688 | 325 | 550.0% |