| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 26°F | 3.3" |
| February | 18°F | 33°F | 25°F | 2.9" |
| March | 27°F | 45°F | 35°F | 4.4" |
| April | 37°F | 58°F | 47°F | 5.0" |
| May | 48°F | 70°F | 59°F | 6.0" |
| June | 58°F | 79°F | 68°F | 5.5" |
| July | 62°F | 83°F | 73°F | 7.1" |
| August | 61°F | 81°F | 71°F | 7.3" |
| September | 54°F | 74°F | 64°F | 6.6" |
| October | 44°F | 62°F | 53°F | 4.9" |
| November | 33°F | 49°F | 41°F | 4.2" |
| December | 25°F | 37°F | 31°F | 3.8" |
| Index | Marine City | Michigan | National |
| Air quality index | 56 | 69 | 42 |
| Pollution index | 30,180,300 | 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 | 0.030% |
| Benzene | 0.390% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.130% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Marysville, MI | 9,695 | 56 | 12.0% |
| Richmond, MI | 5,851 | 56 | 12.0% |
| Memphis, MI | 1,064 | 56 | 12.0% |
| St. Clair, MI | 5,354 | 56 | 12.0% |
| New Baltimore, MI | 12,333 | 56 | 12.0% |
| Marine City, MI | 4,083 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Shrewsbury, NJ | 4,082 | 51 | 2.0% |
| Nokomis, FL | 4,084 | 38 | 24.0% |
| Camdenton, MO | 4,084 | 39 | 22.0% |
| Whiteriver, AZ | 4,081 | 44 | 12.0% |
| Sullivan, IN | 4,081 | 45 | 10.0% |
| Marine City, MI | 4,083 | 56 | 12.0% |
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