| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 45°F | 35°F | 3.7" |
| February | 29°F | 47°F | 37°F | 2.9" |
| March | 39°F | 60°F | 48°F | 4.5" |
| April | 48°F | 71°F | 59°F | 6.3" |
| May | 57°F | 79°F | 68°F | 5.7" |
| June | 66°F | 87°F | 77°F | 5.3" |
| July | 69°F | 89°F | 79°F | 5.6" |
| August | 68°F | 89°F | 78°F | 3.7" |
| September | 61°F | 83°F | 71°F | 4.6" |
| October | 48°F | 71°F | 59°F | 4.4" |
| November | 38°F | 59°F | 48°F | 3.5" |
| December | 31°F | 48°F | 39°F | 4.8" |
| Index | Charlestown | Indiana | National |
| Air quality index | 49 | 56 | 42 |
| Pollution index | 751,900 | 2,719,453 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Henryville, IN | 1,698 | 49 | 2.0% |
| Galena, IN | 1,253 | 49 | 2.0% |
| Forest Hills, KY | 451 | 49 | 2.0% |
| Kingsley, KY | 425 | 49 | 2.0% |
| Norbourne Estates, KY | 510 | 49 | 2.0% |
| Charlestown, IN | 8,290 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Fletcher, NC | 8,287 | 44 | 12.0% |
| Lake Carmel, NY | 8,287 | 36 | 28.0% |
| York, SC | 8,287 | 36 | 28.0% |
| Bradford, PA | 8,284 | 9 | 82.0% |
| Mystic Island, NJ | 8,296 | 37 | 26.0% |
| Charlestown, IN | 8,290 | 49 | 2.0% |
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