| 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. |
| Bardstown, KY | 13,169 | 39 | 22.0% |
| Springfield, KY | 2,965 | 39 | 22.0% |
| Mackville, KY | 244 | 42 | 16.0% |
| Elk Creek, KY | 1,848 | 49 | 2.0% |
| Fairfield, KY | 185 | 49 | 2.0% |
| Chaplin, KY | 577 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Fields Landing, CA | 577 | 27 | 46.0% |
| Cedarville, MD | 577 | 47 | 6.0% |
| Oak Hill, MI | 577 | 36 | 28.0% |
| Martinsburg, MO | 577 | 38 | 24.0% |
| Austinburg, OH | 577 | 34 | 32.0% |
| Chaplin, KY | 577 | 49 | 2.0% |
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