| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 44°F | 34°F | 2.9" |
| February | 28°F | 46°F | 36°F | 2.9" |
| March | 39°F | 60°F | 49°F | 4.7" |
| April | 49°F | 72°F | 60°F | 5.9" |
| May | 58°F | 79°F | 68°F | 4.9" |
| June | 67°F | 88°F | 77°F | 4.9" |
| July | 69°F | 89°F | 79°F | 5.6" |
| August | 68°F | 89°F | 78°F | 3.2" |
| September | 60°F | 83°F | 71°F | 4.9" |
| October | 48°F | 71°F | 59°F | 4.4" |
| November | 38°F | 59°F | 47°F | 3.6" |
| December | 32°F | 48°F | 39°F | 4.4" |
| Index | Onton | Kentucky | National |
| Air quality index | 43 | 45 | 42 |
| Pollution index | 768,150 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 276 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Manitou, KY | 530 | 43 | 14.0% |
| Bremen, KY | 350 | 43 | 14.0% |
| Nebo, KY | 162 | 43 | 14.0% |
| Calhoun, KY | 726 | 43 | 14.0% |
| Sebree, KY | 1,552 | 43 | 14.0% |
| Onton, KY | 18 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockville, AL | 18 | 42 | 16.0% |
| Shoshone, CA | 18 | 15 | 70.0% |
| Conejos, CO | 18 | 15 | 70.0% |
| Piedra, CO | 18 | 44 | 12.0% |
| Elkport, IA | 18 | 29 | 42.0% |
| Onton, KY | 18 | 43 | 14.0% |
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