| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 56°F | 44°F | 2.5" |
| February | 38°F | 60°F | 47°F | 2.1" |
| March | 47°F | 69°F | 56°F | 2.9" |
| April | 54°F | 76°F | 64°F | 4.7" |
| May | 61°F | 82°F | 71°F | 5.6" |
| June | 71°F | 91°F | 81°F | 4.5" |
| July | 74°F | 95°F | 84°F | 3.1" |
| August | 74°F | 96°F | 84°F | 3.1" |
| September | 67°F | 89°F | 77°F | 2.9" |
| October | 56°F | 79°F | 66°F | 3.1" |
| November | 46°F | 67°F | 56°F | 2.9" |
| December | 37°F | 56°F | 45°F | 2.6" |
| Index | Southmayd | Texas | National |
| Air quality index | 325 | 52 | 42 |
| Pollution index | 8,884,190 | 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 | 0.030% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.260% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Lake Kiowa, TX | 2,418 | 43 | 14.0% |
| Callisburg, TX | 240 | 43 | 14.0% |
| Pottsboro, TX | 2,418 | 325 | 550.0% |
| Howe, TX | 3,204 | 325 | 550.0% |
| Van Alstyne, TX | 4,153 | 325 | 550.0% |
| Southmayd, TX | 1,510 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Beechwood Village, KY | 1,510 | 49 | 2.0% |
| Clara City, MN | 1,510 | 32 | 36.0% |
| Vernon, NY | 1,510 | 27 | 46.0% |
| Wickerham Manor-Fisher, PA | 1,510 | 56 | 12.0% |
| Bloomington, TX | 1,510 | 31 | 38.0% |
| Southmayd, TX | 1,510 | 325 | 550.0% |
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