| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 61°F | 49°F | 6.8" |
| February | 46°F | 69°F | 56°F | 5.8" |
| March | 52°F | 74°F | 62°F | 14.0" |
| April | 57°F | 79°F | 67°F | 5.5" |
| May | 61°F | 81°F | 70°F | 10.8" |
| June | 70°F | 89°F | 79°F | 9.6" |
| July | 73°F | 94°F | 83°F | 2.4" |
| August | 71°F | 93°F | 81°F | 12.6" |
| September | 66°F | 91°F | 77°F | 8.6" |
| October | 58°F | 84°F | 69°F | 12.1" |
| November | 49°F | 72°F | 59°F | 9.5" |
| December | 43°F | 63°F | 51°F | 8.5" |
| Index | Overton | Texas | National |
| Air quality index | 36 | 52 | 42 |
| Pollution index | 3,084,680 | 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 | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| New Chapel Hill, TX | 715 | 36 | 28.0% |
| Troup, TX | 2,034 | 36 | 28.0% |
| Whitehouse, TX | 8,673 | 36 | 28.0% |
| Winona, TX | 628 | 36 | 28.0% |
| Arp, TX | 1,402 | 36 | 28.0% |
| Overton, TX | 3,051 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Momence, IL | 3,051 | 55 | 10.0% |
| Barbourville, KY | 3,051 | 39 | 22.0% |
| White Sulphur Springs, WV | 3,051 | 41 | 18.0% |
| Welcome, NC | 3,050 | 40 | 20.0% |
| New Maryland, NB | 3,050 | n/a | |
| Overton, TX | 3,051 | 36 | 28.0% |
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