| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 60°F | 44°F | 0.9" |
| February | 36°F | 67°F | 50°F | 0.2" |
| March | 42°F | 75°F | 58°F | 0.5" |
| April | 49°F | 81°F | 65°F | 0.7" |
| May | 56°F | 86°F | 71°F | 1.0" |
| June | 65°F | 92°F | 78°F | 1.9" |
| July | 65°F | 90°F | 77°F | 2.9" |
| August | 64°F | 89°F | 76°F | 2.6" |
| September | 59°F | 83°F | 70°F | 2.2" |
| October | 50°F | 79°F | 64°F | 0.9" |
| November | 40°F | 69°F | 53°F | 0.9" |
| December | 34°F | 62°F | 47°F | 0.5" |
| Index | Marathon | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 212,433 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Marathon, TX | 365 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Reeltown, AL | 365 | 52 | 4.0% |
| Xenia, IL | 365 | 43 | 14.0% |
| Neosho Rapids, KS | 365 | 22 | 56.0% |
| Ages, KY | 365 | 39 | 22.0% |
| Spring Mill, KY | 365 | 49 | 2.0% |
| Marathon, TX | 365 | 28 | 44.0% |
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