| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 39°F | 30°F | 2.5" |
| February | 21°F | 41°F | 31°F | 2.5" |
| March | 32°F | 55°F | 42°F | 4.0" |
| April | 41°F | 68°F | 54°F | 4.1" |
| May | 52°F | 76°F | 64°F | 3.9" |
| June | 60°F | 83°F | 71°F | 5.2" |
| July | 62°F | 85°F | 73°F | 4.8" |
| August | 60°F | 85°F | 72°F | 3.7" |
| September | 53°F | 79°F | 65°F | 3.4" |
| October | 42°F | 67°F | 54°F | 3.7" |
| November | 32°F | 55°F | 43°F | 2.9" |
| December | 27°F | 45°F | 35°F | 3.5" |
| Index | Carroll | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 21,574,800 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.230% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.190% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Rockbridge, OH | 47 | 25 | 50.0% |
| Hide-A-Way Hills, OH | 833 | 25 | 50.0% |
| Sugar Grove, OH | 363 | 25 | 50.0% |
| Bremen, OH | 1,477 | 25 | 50.0% |
| Circleville, OH | 13,986 | 46 | 8.0% |
| Carroll, OH | 443 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Assaria, KS | 443 | 32 | 36.0% |
| Cunningham, KS | 443 | 40 | 20.0% |
| Sacramento, KY | 443 | 43 | 14.0% |
| Bethel, MN | 443 | 46 | 8.0% |
| Jumpertown, MS | 443 | 39 | 22.0% |
| Carroll, OH | 443 | 46 | 8.0% |
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