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| 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 | Dupont | Indiana | National |
| Air quality index | 35 | 56 | 42 |
| Pollution index | 8,502,260 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 340 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.670% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hayden, IN | 542 | 35 | 30.0% |
| Versailles, IN | 1,719 | 35 | 30.0% |
| Madison, IN | 11,783 | 35 | 30.0% |
| Canaan, IN | 70 | 35 | 30.0% |
| Holton, IN | 683 | 35 | 30.0% |
| Dupont, IN | 318 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Ranch, CA | 318 | 39 | 22.0% |
| Red Cliff, CO | 318 | 47 | 6.0% |
| Redvale, CO | 318 | 44 | 12.0% |
| McCune, KS | 318 | 38 | 24.0% |
| San Mar, MD | 318 | 40 | 20.0% |
| Dupont, IN | 318 | 35 | 30.0% |
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