| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 46°F | 37°F | 7.2" |
| February | 24°F | 44°F | 33°F | 3.6" |
| March | 35°F | 58°F | 46°F | 5.3" |
| April | 43°F | 67°F | 55°F | 7.0" |
| May | 50°F | 78°F | 64°F | 5.5" |
| June | 62°F | 86°F | 74°F | 2.0" |
| July | 65°F | 88°F | 76°F | 5.7" |
| August | 68°F | 92°F | 79°F | 8.9" |
| September | 59°F | 85°F | 71°F | 2.7" |
| October | 48°F | 72°F | 59°F | 10.4" |
| November | 35°F | 59°F | 46°F | 5.6" |
| December | 29°F | 45°F | 36°F | 5.7" |
| Index | Frankfort | Kentucky | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 5,590,360 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 303 |
| Days with moderate air quality | 62 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.070% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Stamping Ground, KY | 992 | 42 | 16.0% |
| Versailles, KY | 9,251 | 42 | 16.0% |
| Lawrenceburg, KY | 11,416 | 42 | 16.0% |
| Midway, KY | 1,864 | 42 | 16.0% |
| Pleasureville, KY | 1,409 | 49 | 2.0% |
| Frankfort, KY | 27,705 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Marion, IN | 27,730 | 37 | 26.0% |
| Garfield Heights, OH | 27,673 | 50 | = 100 |
| Rockledge, FL | 27,739 | 36 | 28.0% |
| Glen Ellyn, IL | 27,741 | 55 | 10.0% |
| Oxford, MS | 27,662 | 33 | 34.0% |
| Frankfort, KY | 27,705 | 42 | 16.0% |
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