| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 3.0" |
| February | 19°F | 34°F | 26°F | 2.7" |
| March | 27°F | 45°F | 35°F | 3.0" |
| April | 39°F | 61°F | 49°F | 3.3" |
| May | 50°F | 72°F | 60°F | 3.9" |
| June | 60°F | 82°F | 70°F | 4.0" |
| July | 64°F | 84°F | 73°F | 4.5" |
| August | 63°F | 83°F | 72°F | 3.2" |
| September | 56°F | 77°F | 65°F | 3.2" |
| October | 46°F | 64°F | 54°F | 2.9" |
| November | 34°F | 51°F | 42°F | 2.9" |
| December | 24°F | 37°F | 30°F | 3.4" |
| Index | Ecorse | Michigan | National |
| Air quality index | 56 | 69 | 42 |
| Pollution index | 180,667 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 135 |
| Days with moderate air quality | 217 |
| Days w/ poor A.Q. for sensitive groups | 13 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| South Rockwood, MI | 1,903 | 1 | 98.0% |
| Woodhaven, MI | 12,501 | 1 | 98.0% |
| Rockwood, MI | 3,177 | 1 | 98.0% |
| Flat Rock, MI | 9,974 | 1 | 98.0% |
| Gibraltar, MI | 4,546 | 1 | 98.0% |
| Ecorse, MI | 9,456 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Coral Hills, MD | 9,457 | 47 | 6.0% |
| Hickam Housing, HI | 9,463 | 30 | 40.0% |
| Fair Oaks, GA | 9,447 | 52 | 4.0% |
| Sunbury, PA | 9,446 | 35 | 30.0% |
| Leeds and the Thousand Islands, ON | 9,445 | n/a | |
| Ecorse, MI | 9,456 | 56 | 12.0% |
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