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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 | Madison | 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. |
| Deputy, IN | 34 | 35 | 30.0% |
| Milton, KY | 615 | 35 | 30.0% |
| Dupont, IN | 318 | 35 | 30.0% |
| Carrollton, KY | 3,806 | 35 | 30.0% |
| Hanover, IN | 3,418 | 35 | 30.0% |
| Madison, IN | 11,783 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Richfield, WI | 11,782 | 44 | 12.0% |
| Stony Brook, NY | 11,785 | 43 | 14.0% |
| Red Bank, TN | 11,785 | 46 | 8.0% |
| North Wantagh, NY | 11,792 | 51 | 2.0% |
| North Dundas, ON | 11,794 | n/a | |
| Madison, IN | 11,783 | 35 | 30.0% |
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