| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 43°F | 33°F | 3.7" |
| February | 26°F | 46°F | 35°F | 3.3" |
| March | 36°F | 59°F | 47°F | 4.3" |
| April | 45°F | 70°F | 57°F | 5.9" |
| May | 54°F | 77°F | 65°F | 5.1" |
| June | 62°F | 85°F | 73°F | 4.7" |
| July | 66°F | 87°F | 76°F | 6.3" |
| August | 64°F | 87°F | 75°F | 2.8" |
| September | 57°F | 81°F | 69°F | 3.8" |
| October | 45°F | 70°F | 57°F | 4.0" |
| November | 35°F | 58°F | 45°F | 3.1" |
| December | 29°F | 48°F | 38°F | 4.7" |
| Index | Chaplin | Kentucky | National |
| Air quality index | 49 | 45 | 42 |
| Pollution index | 306,537 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 195 |
| Days with moderate air quality | 166 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Springfield, KY | 3,048 | 39 | 22.0% |
| Bardstown, KY | 13,551 | 39 | 22.0% |
| Mackville, KY | 252 | 42 | 16.0% |
| Elk Creek, KY | 1,888 | 49 | 2.0% |
| Fairfield, KY | 191 | 49 | 2.0% |
| Chaplin, KY | 594 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Gurley, AL | 594 | 44 | 12.0% |
| Graham, GA | 594 | 26 | 48.0% |
| Junction City, IL | 594 | 43 | 14.0% |
| Pleasant Hill, LA | 594 | 39 | 22.0% |
| Melrose, NM | 594 | 15 | 70.0% |
| Chaplin, KY | 594 | 49 | 2.0% |