| 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 | East Chicago | Indiana | National |
| Air quality index | 60 | 56 | 50 |
| Pollution index | 80,238,704 | 3,773,618 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 72 |
| Days with moderate air quality | 281 |
| Days w/ poor A.Q. for sensitive groups | 11 |
| 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, State | Population | Air Quality Index | National Avg. |
| Lake Station, IN | 12,199 | 31 | 38% |
| Ogden Dunes, IN | 1,138 | 31 | 38% |
| Wheeler, IN | 302 | 31 | 38% |
| Merrillville, IN | 35,268 | 31 | 38% |
| Portage, IN | 37,054 | 31 | 38% |
| East Chicago, IN | 28,961 | 60 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| Golden Gate, FL | 28,928 | 33 | 34% |
| Burton, MI | 28,995 | 38 | 24% |
| Wellesley, MA | 28,909 | 47 | 6% |
| Lake in the Hills, IL | 28,908 | 31 | 38% |
| East Haven, CT | 29,015 | 49 | 2% |
| East Chicago, IN | 28,961 | 60 | 20% |