| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 46°F | 37°F | 4.5" |
| February | 31°F | 49°F | 39°F | 3.7" |
| March | 41°F | 61°F | 50°F | 7.8" |
| April | 51°F | 72°F | 61°F | 7.9" |
| May | 60°F | 80°F | 69°F | 6.9" |
| June | 69°F | 90°F | 79°F | 6.4" |
| July | 70°F | 90°F | 79°F | 5.7" |
| August | 68°F | 89°F | 77°F | 4.3" |
| September | 60°F | 83°F | 70°F | 2.8" |
| October | 49°F | 73°F | 60°F | 4.4" |
| November | 39°F | 60°F | 49°F | 8.5" |
| December | 33°F | 49°F | 40°F | 8.2" |
| Index | Columbus | Kentucky | National |
| Air quality index | 44 | 45 | 42 |
| Pollution index | 1,566,340 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 261 |
| Days with moderate air quality | 103 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cayce, KY | 142 | 26 | 48.0% |
| Hickman, KY | 2,005 | 26 | 48.0% |
| Blandville, KY | 87 | 44 | 12.0% |
| Wickliffe, KY | 756 | 44 | 12.0% |
| Charleston, MO | 5,478 | 44 | 12.0% |
| Columbus, KY | 239 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Upper Kalskag, AK | 239 | 31 | 38.0% |
| Bakerhill, AL | 239 | 35 | 30.0% |
| Fredonia (Biscoe), AR | 239 | 45 | 10.0% |
| Cushing, IA | 239 | 35 | 30.0% |
| Metcalf, IL | 239 | 45 | 10.0% |
| Columbus, KY | 239 | 44 | 12.0% |
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