| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 45°F | 5.9" |
| February | 39°F | 61°F | 49°F | 5.6" |
| March | 47°F | 70°F | 57°F | 8.2" |
| April | 54°F | 77°F | 64°F | 8.9" |
| May | 61°F | 83°F | 71°F | 6.0" |
| June | 70°F | 91°F | 79°F | 6.0" |
| July | 72°F | 94°F | 82°F | 3.4" |
| August | 72°F | 94°F | 82°F | 10.4" |
| September | 65°F | 88°F | 76°F | 14.7" |
| October | 53°F | 79°F | 65°F | 15.7" |
| November | 45°F | 68°F | 55°F | 8.1" |
| December | 38°F | 59°F | 47°F | 10.1" |
| Index | Marietta | Texas | National |
| Air quality index | 39 | 52 | 42 |
| Pollution index | 2,304,530 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 254 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.900% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 1.100% |
| City | Population | Air Quality Index | National Avg. |
| Daingerfield, TX | 2,679 | 37 | 26.0% |
| Hughes Springs, TX | 1,534 | 37 | 26.0% |
| Linden, TX | 2,238 | 38 | 24.0% |
| Naples, TX | 1,493 | 39 | 22.0% |
| Douglassville, TX | 332 | 39 | 22.0% |
| Marietta, TX | 90 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Utting, AZ | 90 | 13 | 74.0% |
| C-Road, CA | 90 | 44 | 12.0% |
| Darwin, CA | 90 | 15 | 70.0% |
| Tarrytown, GA | 90 | 26 | 48.0% |
| Odin, KS | 90 | 40 | 20.0% |
| Marietta, TX | 90 | 39 | 22.0% |
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