| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 32°F | 3.4" |
| February | 23°F | 44°F | 33°F | 3.1" |
| March | 33°F | 57°F | 44°F | 4.6" |
| April | 43°F | 69°F | 56°F | 5.0" |
| May | 52°F | 77°F | 64°F | 4.0" |
| June | 61°F | 85°F | 73°F | 5.2" |
| July | 65°F | 87°F | 76°F | 4.0" |
| August | 64°F | 88°F | 76°F | 3.0" |
| September | 57°F | 81°F | 69°F | 4.1" |
| October | 45°F | 69°F | 57°F | 4.1" |
| November | 34°F | 57°F | 45°F | 3.5" |
| December | 27°F | 45°F | 36°F | 4.5" |
| Index | Prestonville | Kentucky | National |
| Air quality index | 35 | 45 | 42 |
| Pollution index | 8,502,260 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 340 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.670% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Milton, KY | 629 | 35 | 30.0% |
| Canaan, IN | 72 | 35 | 30.0% |
| Carrollton, KY | 3,911 | 35 | 30.0% |
| Hanover, IN | 3,523 | 35 | 30.0% |
| Madison, IN | 12,030 | 35 | 30.0% |
| Prestonville, KY | 192 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Nikolaevsk, AK | 192 | 31 | 38.0% |
| Bluff City, AR | 192 | 32 | 36.0% |
| Cottonwood CDP, AZ | 192 | 43 | 14.0% |
| Lewis, CO | 192 | 44 | 12.0% |
| Avalon, GA | 192 | 41 | 18.0% |
| Prestonville, KY | 192 | 35 | 30.0% |