| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 42°F | 32°F | 3.4" |
| February | 25°F | 44°F | 33°F | 2.6" |
| March | 34°F | 56°F | 44°F | 3.9" |
| April | 43°F | 69°F | 56°F | 4.2" |
| May | 52°F | 76°F | 63°F | 4.1" |
| June | 60°F | 83°F | 71°F | 4.9" |
| July | 64°F | 85°F | 74°F | 4.8" |
| August | 63°F | 86°F | 73°F | 3.6" |
| September | 56°F | 80°F | 67°F | 3.2" |
| October | 45°F | 68°F | 55°F | 3.7" |
| November | 35°F | 57°F | 45°F | 2.9" |
| December | 29°F | 46°F | 37°F | 4.2" |
| Index | Coolville | Ohio | National |
| Air quality index | 35 | 40 | 42 |
| Pollution index | 874,439 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 333 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Pomeroy, OH | 1,752 | 25 | 50.0% |
| Mason, WV | 712 | 25 | 50.0% |
| Stewart, OH | 326 | 25 | 50.0% |
| Tuppers Plains, OH | 375 | 25 | 50.0% |
| Amesville, OH | 135 | 25 | 50.0% |
| Coolville, OH | 556 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Nunn, CO | 556 | 48 | 4.0% |
| Warm Springs, GA | 556 | 42 | 16.0% |
| Adams, NE | 556 | 31 | 38.0% |
| Dorchester, NE | 556 | 31 | 38.0% |
| Schenevus, NY | 556 | 27 | 46.0% |
| Coolville, OH | 556 | 35 | 30.0% |
Here are the best places to live in Ohio
These are the 10 cheapest cities in Ohio
Most Dangerous States In The US
Check out the 10 safest cities in Ohio