| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 4.7" |
| February | 22°F | 40°F | 30°F | 4.9" |
| March | 33°F | 54°F | 42°F | 6.6" |
| April | 42°F | 67°F | 54°F | 6.8" |
| May | 52°F | 75°F | 64°F | 6.8" |
| June | 61°F | 83°F | 72°F | 7.3" |
| July | 64°F | 85°F | 75°F | 8.6" |
| August | 63°F | 85°F | 74°F | 6.8" |
| September | 56°F | 79°F | 66°F | 6.6" |
| October | 44°F | 67°F | 55°F | 6.5" |
| November | 33°F | 55°F | 43°F | 6.1" |
| December | 27°F | 43°F | 34°F | 6.1" |
| Index | Downtown | Dayton | Ohio |
| Air quality index | 47 | 47 | 40 |
| Pollution index | 11,539,300 | 11,539,300 | 4,472,386 |
| 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 | 0.210% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.110% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Spring Valley, OH | 855 | 43 | 14.0% |
| New Burlington, OH | 4,526 | 43 | 14.0% |
| Green Meadows, OH | 2,060 | 45 | 10.0% |
| Donnelsville, OH | 329 | 45 | 10.0% |
| New Carlisle, OH | 5,577 | 45 | 10.0% |
| Dayton, OH | 140,444 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Miramar, FL | 140,479 | 41 | 18.0% |
| Cambridge, ON | 140,221 | n/a | |
| St. Catharines, ON | 140,913 | n/a | |
| Fullerton, CA | 141,061 | 72 | 44.0% |
| Denton, TX | 139,734 | 51 | 2.0% |
| Dayton, OH | 140,444 | 47 | 6.0% |
Here are the best places to live in Ohio
Most Dangerous Cities In The US
Check out the 10 safest cities in Ohio
These are the 10 cheapest cities in Ohio