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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 35°F | 29°F | 3.1" |
| February | 22°F | 36°F | 29°F | 1.8" |
| March | 34°F | 49°F | 41°F | 8.5" |
| April | 43°F | 62°F | 52°F | 4.3" |
| May | 53°F | 72°F | 62°F | 7.9" |
| June | 62°F | 80°F | 71°F | 3.6" |
| July | 67°F | 83°F | 76°F | 9.5" |
| August | 65°F | 82°F | 74°F | 6.3" |
| September | 58°F | 76°F | 67°F | 7.6" |
| October | 47°F | 65°F | 56°F | 8.0" |
| November | 37°F | 52°F | 44°F | 5.7" |
| December | 27°F | 39°F | 33°F | 2.7" |
| Index | Gary | Indiana | National |
| Air quality index | 55 | 56 | 42 |
| Pollution index | 80,238,704 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 121 |
| Days with moderate air quality | 227 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.760% |
| Benzene | 0.560% |
| Carbon Tetrachloride | 0.280% |
| Lead | 0.480% |
| Mercury | 0.480% |
| City | Population | Air Quality Index | National Avg. |
| Merrillville, IN | 34,871 | 37 | 26.0% |
| Aberdeen, IN | 1,698 | 37 | 26.0% |
| Lakes of the Four Seasons, IN | 7,081 | 37 | 26.0% |
| Salt Creek Commons, IN | 1,941 | 37 | 26.0% |
| Winfield, IN | 5,879 | 37 | 26.0% |
| Gary, IN | 75,486 | 55 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Georgetown, TX | 75,470 | 44 | 12.0% |
| Bethlehem, PA | 75,571 | 42 | 16.0% |
| St. Joseph, MO | 75,369 | 43 | 14.0% |
| Missouri City, TX | 75,348 | 52 | 4.0% |
| Carmichael, CA | 75,642 | 52 | 4.0% |
| Gary, IN | 75,486 | 55 | 10.0% |
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