| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 37°F | 27°F | 3.1" |
| February | 19°F | 38°F | 28°F | 2.7" |
| March | 28°F | 50°F | 38°F | 3.6" |
| April | 39°F | 65°F | 51°F | 3.6" |
| May | 49°F | 74°F | 61°F | 4.0" |
| June | 58°F | 82°F | 70°F | 5.4" |
| July | 62°F | 85°F | 73°F | 4.5" |
| August | 61°F | 84°F | 72°F | 3.8" |
| September | 54°F | 78°F | 65°F | 3.6" |
| October | 43°F | 65°F | 53°F | 4.2" |
| November | 32°F | 53°F | 42°F | 3.3" |
| December | 25°F | 41°F | 32°F | 3.5" |
| Index | Marlboro | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 9,777,500 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 226 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.070% |
| Mercury | 0.300% |
| City | Population | Air Quality Index | National Avg. |
| Hanoverton, OH | 310 | 6 | 88.0% |
| Lake Milton, OH | 541 | 42 | 16.0% |
| Craig Beach, OH | 1,645 | 42 | 16.0% |
| Damascus, OH | 286 | 42 | 16.0% |
| Lakemore, OH | 3,070 | 43 | 14.0% |
| Marlboro, OH | 296 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| St. Joe, AR | 296 | 36 | 28.0% |
| Ionia, IA | 296 | 39 | 22.0% |
| Modale, IA | 296 | 40 | 20.0% |
| Alma, IL | 296 | 43 | 14.0% |
| Fillmore, IL | 296 | 40 | 20.0% |
| Marlboro, OH | 296 | 46 | 8.0% |
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