| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 53°F | 39°F | 1.1" |
| February | 32°F | 56°F | 42°F | 2.7" |
| March | 43°F | 68°F | 54°F | 3.0" |
| April | 51°F | 76°F | 62°F | 5.2" |
| May | 59°F | 82°F | 69°F | 4.8" |
| June | 70°F | 92°F | 80°F | 5.4" |
| July | 73°F | 96°F | 84°F | 5.0" |
| August | 72°F | 95°F | 82°F | 3.9" |
| September | 63°F | 87°F | 74°F | 3.2" |
| October | 52°F | 77°F | 63°F | 3.2" |
| November | 41°F | 65°F | 52°F | 2.6" |
| December | 31°F | 52°F | 40°F | 1.4" |
| Index | Wellston | Oklahoma | National |
| Air quality index | 36 | 55 | 42 |
| Pollution index | 715,482 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 231 |
| Days with good air quality | 216 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.030% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Fallis, OK | 19 | 36 | 28.0% |
| Tryon, OK | 618 | 36 | 28.0% |
| Harrah, OK | 6,480 | 36 | 28.0% |
| Agra, OK | 321 | 36 | 28.0% |
| Sparks, OK | 163 | 36 | 28.0% |
| Wellston, OK | 858 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Sedan, KS | 858 | 40 | 20.0% |
| East Bernstadt, KY | 858 | 40 | 20.0% |
| Griggstown, NJ | 858 | 41 | 18.0% |
| Butler, OH | 858 | 41 | 18.0% |
| Marblehead, OH | 858 | 1 | 98.0% |
| Wellston, OK | 858 | 36 | 28.0% |
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