| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 40°F | 33°F | 7.1" |
| February | 20°F | 36°F | 28°F | 3.7" |
| March | 34°F | 53°F | 42°F | 5.4" |
| April | 41°F | 64°F | 52°F | 5.8" |
| May | 50°F | 75°F | 63°F | 4.5" |
| June | 62°F | 84°F | 73°F | 4.7" |
| July | 64°F | 84°F | 74°F | 5.1" |
| August | 66°F | 88°F | 77°F | 5.8" |
| September | 58°F | 81°F | 69°F | 7.4" |
| October | 49°F | 67°F | 58°F | 6.6" |
| November | 34°F | 55°F | 44°F | 9.5" |
| December | 25°F | 39°F | 31°F | 4.6" |
| Index | Middletown | Ohio | National |
| Air quality index | 47 | 40 | 42 |
| Pollution index | 7,300,490 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 213 |
| Days with moderate air quality | 152 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.520% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.240% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Somerville, OH | 304 | 6 | 88.0% |
| Camden, OH | 2,120 | 6 | 88.0% |
| Butlerville, OH | 216 | 43 | 14.0% |
| Lebanon, OH | 20,781 | 43 | 14.0% |
| Waynesville, OH | 3,135 | 43 | 14.0% |
| Middletown, OH | 48,765 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| San Jacinto, CA | 48,786 | 89 | 78.0% |
| Shawinigan, QC | 48,810 | n/a | |
| Columbus, IN | 48,820 | 41 | 18.0% |
| Florin, CA | 48,839 | 52 | 4.0% |
| North Highlands, CA | 48,660 | 52 | 4.0% |
| Middletown, OH | 48,765 | 47 | 6.0% |
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