| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 2.9" |
| February | 20°F | 38°F | 28°F | 2.9" |
| March | 29°F | 50°F | 38°F | 3.4" |
| April | 39°F | 63°F | 50°F | 4.7" |
| May | 50°F | 74°F | 62°F | 4.8" |
| June | 58°F | 81°F | 69°F | 5.2" |
| July | 62°F | 84°F | 73°F | 3.8" |
| August | 60°F | 82°F | 71°F | 3.0" |
| September | 54°F | 77°F | 65°F | 3.3" |
| October | 44°F | 65°F | 54°F | 3.6" |
| November | 33°F | 53°F | 42°F | 3.4" |
| December | 25°F | 40°F | 32°F | 3.3" |
| Index | Bellville | Ohio | National |
| Air quality index | 41 | 40 | 42 |
| Pollution index | 1,197,810 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 218 |
| Days with moderate air quality | 27 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fredericktown, OH | 2,510 | 41 | 18.0% |
| Lucas, OH | 493 | 41 | 18.0% |
| Lexington, OH | 4,937 | 41 | 18.0% |
| Mifflin, OH | 190 | 41 | 18.0% |
| Danville, OH | 850 | 41 | 18.0% |
| Bellville, OH | 1,999 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Morris, AL | 1,999 | 53 | 6.0% |
| Englishtown, NJ | 1,999 | 41 | 18.0% |
| Morrow, OH | 1,999 | 43 | 14.0% |
| South Park, WY | 1,999 | 43 | 14.0% |
| Century, FL | 1,998 | 41 | 18.0% |
| Bellville, OH | 1,999 | 41 | 18.0% |
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