| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 43°F | 34°F | 6.1" |
| February | 27°F | 46°F | 35°F | 5.4" |
| March | 38°F | 59°F | 47°F | 8.7" |
| April | 47°F | 71°F | 58°F | 10.2" |
| May | 58°F | 79°F | 68°F | 7.3" |
| June | 66°F | 87°F | 76°F | 7.8" |
| July | 67°F | 89°F | 77°F | 9.5" |
| August | 66°F | 88°F | 76°F | 6.9" |
| September | 58°F | 82°F | 69°F | 11.3" |
| October | 47°F | 71°F | 58°F | 10.3" |
| November | 37°F | 58°F | 46°F | 8.2" |
| December | 30°F | 47°F | 38°F | 9.0" |
| Index | Henderson | Kentucky | National |
| Air quality index | 45 | 45 | 42 |
| Pollution index | 4,284,280 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Evansville, IN | 118,414 | 45 | 10.0% |
| Corydon, KY | 746 | 45 | 10.0% |
| Robards, KY | 481 | 45 | 10.0% |
| Melody Hill, IN | 3,481 | 45 | 10.0% |
| Spottsville, KY | 355 | 45 | 10.0% |
| Henderson, KY | 28,469 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Burbank, IL | 28,447 | 55 | 10.0% |
| Jacksonville, AR | 28,442 | 45 | 10.0% |
| Woolwich, ON | 28,438 | n/a | |
| Williamsport, PA | 28,437 | 35 | 30.0% |
| Casselberry, FL | 28,502 | 39 | 22.0% |
| Henderson, KY | 28,469 | 45 | 10.0% |
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