| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 29°F | 2.3" |
| February | 21°F | 40°F | 30°F | 2.2" |
| March | 31°F | 53°F | 41°F | 3.9" |
| April | 41°F | 66°F | 53°F | 3.6" |
| May | 50°F | 75°F | 63°F | 4.0" |
| June | 59°F | 83°F | 71°F | 5.2" |
| July | 62°F | 84°F | 73°F | 4.3" |
| August | 60°F | 84°F | 71°F | 3.6" |
| September | 53°F | 78°F | 65°F | 3.2" |
| October | 42°F | 67°F | 53°F | 3.3" |
| November | 32°F | 55°F | 42°F | 2.6" |
| December | 26°F | 43°F | 34°F | 3.6" |
| Index | Millersport | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 21,574,800 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.230% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.190% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bremen, OH | 1,477 | 25 | 50.0% |
| Somerset, OH | 1,796 | 25 | 50.0% |
| Junction City, OH | 800 | 25 | 50.0% |
| Granville, OH | 5,829 | 41 | 18.0% |
| Marne, OH | 482 | 41 | 18.0% |
| Millersport, OH | 1,229 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Forkland, AL | 1,229 | 35 | 30.0% |
| La Honda, CA | 1,229 | 43 | 14.0% |
| Oskaloosa, KS | 1,229 | 41 | 18.0% |
| Auxvasse, MO | 1,229 | 38 | 24.0% |
| Bethesda, OH | 1,229 | 39 | 22.0% |
| Millersport, OH | 1,229 | 46 | 8.0% |
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