| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 38°F | 32°F | 7.7" |
| February | 17°F | 32°F | 25°F | 3.9" |
| March | 34°F | 51°F | 42°F | 9.4" |
| April | 42°F | 62°F | 52°F | 7.6" |
| May | 52°F | 74°F | 64°F | 5.6" |
| June | 63°F | 84°F | 73°F | 6.0" |
| July | 63°F | 82°F | 73°F | 6.8" |
| August | 65°F | 86°F | 76°F | 6.2" |
| September | 56°F | 82°F | 69°F | 7.0" |
| October | 50°F | 70°F | 59°F | 8.8" |
| November | 37°F | 51°F | 44°F | 3.2" |
| December | 24°F | 37°F | 30°F | 3.2" |
| Index | Midway | Ohio | National |
| Air quality index | 38 | 40 | 42 |
| Pollution index | 735,656 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 355 |
| Days with good air quality | 332 |
| Days with moderate air quality | 23 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Bloomingburg, OH | 966 | 38 | 24.0% |
| Pancoastburg, OH | 43 | 38 | 24.0% |
| New Holland, OH | 829 | 38 | 24.0% |
| Milledgeville, OH | 116 | 38 | 24.0% |
| Washington Court House, OH | 14,155 | 38 | 24.0% |
| Midway, OH | 300 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Nulato, AK | 300 | 38 | 24.0% |
| Stirling City, CA | 300 | 46 | 8.0% |
| Trilby, FL | 300 | 36 | 28.0% |
| Bath, IL | 300 | 40 | 20.0% |
| Elizabethtown, IL | 300 | 44 | 12.0% |
| Midway, OH | 300 | 38 | 24.0% |
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