| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 39°F | 29°F | 3.4" |
| February | 22°F | 42°F | 31°F | 1.4" |
| March | 32°F | 56°F | 42°F | 2.6" |
| April | 41°F | 69°F | 54°F | 3.1" |
| May | 53°F | 77°F | 64°F | 3.2" |
| June | 60°F | 84°F | 71°F | 4.4" |
| July | 64°F | 86°F | 74°F | 5.4" |
| August | 61°F | 86°F | 72°F | 5.0" |
| September | 54°F | 79°F | 65°F | 2.7" |
| October | 43°F | 68°F | 54°F | 2.4" |
| November | 32°F | 56°F | 42°F | 4.6" |
| December | 27°F | 44°F | 35°F | 4.0" |
| Index | Wellston | Ohio | National |
| Air quality index | 25 | 40 | 42 |
| Pollution index | 1,306,310 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 116 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.290% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Richmond Dale, OH | 584 | 14 | 72.0% |
| Coalton, OH | 469 | 14 | 72.0% |
| Jackson, OH | 6,233 | 14 | 72.0% |
| Vinton, OH | 307 | 25 | 50.0% |
| McArthur, OH | 1,501 | 25 | 50.0% |
| Wellston, OH | 5,522 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Nashville, NC | 5,521 | 36 | 28.0% |
| Big Flats, NY | 5,523 | 35 | 30.0% |
| Waterford, WI | 5,520 | 39 | 22.0% |
| Mena, AR | 5,524 | 36 | 28.0% |
| Waterville, OH | 5,519 | 40 | 20.0% |
| Wellston, OH | 5,522 | 25 | 50.0% |
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