| 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 | Franklin | 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. |
| Lebanon, OH | 20,781 | 43 | 14.0% |
| Corwin, OH | 434 | 43 | 14.0% |
| Waynesville, OH | 3,135 | 43 | 14.0% |
| Morrow, OH | 1,999 | 43 | 14.0% |
| Bellbrook, OH | 7,277 | 47 | 6.0% |
| Franklin, OH | 11,878 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Eufaula, AL | 11,878 | 42 | 16.0% |
| Gold Canyon, AZ | 11,875 | 74 | 48.0% |
| Port Washington, WI | 11,881 | 44 | 12.0% |
| Garden City, ID | 11,873 | 36 | 28.0% |
| Webb City, MO | 11,884 | 37 | 26.0% |
| Franklin, OH | 11,878 | 47 | 6.0% |
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