| 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 | Preston | Texas | National |
| Air quality index | 325 | 52 | 42 |
| Pollution index | 1,087,550 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Madill, OK | 3,978 | 43 | 14.0% |
| Oakland, OK | 1,032 | 43 | 14.0% |
| Colbert, OK | 1,230 | 325 | 550.0% |
| Mead, OK | 343 | 325 | 550.0% |
| Denison, TX | 24,851 | 325 | 550.0% |
| Preston, TX | 1,759 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Denver, IA | 1,759 | 39 | 22.0% |
| Shelbina, MO | 1,759 | 41 | 18.0% |
| Weston, MO | 1,759 | 43 | 14.0% |
| Seneca Knolls, NY | 1,759 | 37 | 26.0% |
| Edgewood, TX | 1,759 | 36 | 28.0% |
| Preston, TX | 1,759 | 325 | 550.0% |
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