| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 36°F | 28°F | 5.3" |
| February | 16°F | 33°F | 24°F | 1.7" |
| March | 28°F | 49°F | 37°F | 4.0" |
| April | 37°F | 59°F | 47°F | 4.8" |
| May | 47°F | 73°F | 59°F | 5.7" |
| June | 58°F | 83°F | 70°F | 2.2" |
| July | 60°F | 83°F | 71°F | 6.1" |
| August | 61°F | 83°F | 71°F | 4.3" |
| September | 51°F | 79°F | 64°F | 2.8" |
| October | 45°F | 66°F | 55°F | 4.0" |
| November | 32°F | 53°F | 42°F | 3.8" |
| December | 23°F | 37°F | 29°F | 3.3" |
| Index | Marshallville | Ohio | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 11,945,900 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 278 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.270% |
| Benzene | 0.120% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.120% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Wadsworth, OH | 23,789 | 43 | 14.0% |
| Rittman, OH | 6,439 | 43 | 14.0% |
| Burbank, OH | 256 | 43 | 14.0% |
| Smithville, OH | 1,330 | 43 | 14.0% |
| Pigeon Creek, OH | 948 | 43 | 14.0% |
| Marshallville, OH | 896 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Courtland, AL | 896 | 41 | 18.0% |
| Clay City, IL | 896 | 40 | 20.0% |
| Buras, LA | 896 | 45 | 10.0% |
| Cankton, LA | 896 | 41 | 18.0% |
| Cass Lake, MN | 896 | 29 | 42.0% |
| Marshallville, OH | 896 | 43 | 14.0% |
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