| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 47°F | 37°F | 6.4" |
| February | 30°F | 50°F | 39°F | 6.1" |
| March | 41°F | 62°F | 50°F | 6.5" |
| April | 50°F | 72°F | 60°F | 8.0" |
| May | 58°F | 78°F | 68°F | 9.4" |
| June | 66°F | 87°F | 76°F | 6.7" |
| July | 69°F | 89°F | 78°F | 9.1" |
| August | 68°F | 89°F | 78°F | 6.8" |
| September | 61°F | 83°F | 71°F | 7.1" |
| October | 49°F | 72°F | 60°F | 8.6" |
| November | 39°F | 60°F | 49°F | 6.2" |
| December | 33°F | 51°F | 41°F | 7.9" |
| Index | Nortonville | Kentucky | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 5,501,360 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 307 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.800% |
| City | Population | Air Quality Index | National Avg. |
| Crofton, KY | 434 | 40 | 20.0% |
| St. Charles, KY | 305 | 40 | 20.0% |
| White Plains, KY | 949 | 40 | 20.0% |
| Dawson Springs, KY | 2,665 | 40 | 20.0% |
| Mortons Gap, KY | 1,052 | 43 | 14.0% |
| Nortonville, KY | 985 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Hayneville, AL | 985 | 52 | 4.0% |
| Pickensville, AL | 985 | 35 | 30.0% |
| Luxora, AR | 985 | 26 | 48.0% |
| Inwood, IA | 985 | 36 | 28.0% |
| Wisner, LA | 985 | 34 | 32.0% |
| Nortonville, KY | 985 | 40 | 20.0% |
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