| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.9" |
| February | 23°F | 40°F | 30°F | 2.0" |
| March | 32°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 53°F | 3.3" |
| May | 51°F | 73°F | 62°F | 4.2" |
| June | 59°F | 80°F | 69°F | 4.5" |
| July | 63°F | 84°F | 73°F | 3.6" |
| August | 62°F | 83°F | 72°F | 3.9" |
| September | 55°F | 77°F | 65°F | 3.3" |
| October | 45°F | 65°F | 54°F | 3.6" |
| November | 35°F | 54°F | 44°F | 2.6" |
| December | 27°F | 43°F | 34°F | 3.6" |
| Index | Miltonsburg | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 325,471 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 318 |
| Days with moderate air quality | 47 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Summerfield, OH | 214 | 35 | 30.0% |
| Stafford, OH | 86 | 35 | 30.0% |
| Graysville, OH | 67 | 35 | 30.0% |
| Lewisville, OH | 180 | 39 | 22.0% |
| Bethesda, OH | 1,229 | 39 | 22.0% |
| Miltonsburg, OH | 107 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Newhalen, AK | 107 | 31 | 38.0% |
| Casa, AR | 107 | 38 | 24.0% |
| Fifty-Six, AR | 107 | 36 | 28.0% |
| Timber Cove, CA | 107 | 34 | 32.0% |
| Bark Ranch, CO | 107 | 47 | 6.0% |
| Miltonsburg, OH | 107 | 39 | 22.0% |
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