| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 46°F | 39°F | 6.7" |
| February | 28°F | 44°F | 36°F | 4.3" |
| March | 40°F | 60°F | 49°F | 4.9" |
| April | 47°F | 68°F | 57°F | 5.8" |
| May | 56°F | 78°F | 67°F | 6.0" |
| June | 66°F | 86°F | 75°F | 5.9" |
| July | 68°F | 86°F | 77°F | 8.8" |
| August | 71°F | 92°F | 81°F | 12.6" |
| September | 63°F | 85°F | 73°F | 4.4" |
| October | 52°F | 73°F | 61°F | 13.9" |
| November | 39°F | 60°F | 48°F | 7.1" |
| December | 30°F | 46°F | 37°F | 7.5" |
| Index | Brandenburg | Kentucky | National |
| Air quality index | 39 | 45 | 42 |
| Pollution index | 10,162,700 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 318 |
| Days with moderate air quality | 45 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Alton, IN | 23 | 6 | 88.0% |
| Leavenworth, IN | 406 | 6 | 88.0% |
| Doe Valley, KY | 1,969 | 39 | 22.0% |
| Muldraugh, KY | 1,078 | 39 | 22.0% |
| Laconia, IN | 38 | 39 | 22.0% |
| Brandenburg, KY | 2,874 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Harrisburg, AR | 2,874 | 45 | 10.0% |
| Syracuse, IN | 2,874 | 37 | 26.0% |
| Saint-Isidore, QC | 2,874 | n/a | |
| Brighton, AL | 2,873 | 53 | 6.0% |
| Greensboro, MD | 2,873 | 42 | 16.0% |
| Brandenburg, KY | 2,874 | 39 | 22.0% |
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