| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 3.5" |
| February | 16°F | 32°F | 24°F | 2.2" |
| March | 26°F | 43°F | 33°F | 2.2" |
| April | 36°F | 57°F | 45°F | 2.8" |
| May | 46°F | 69°F | 57°F | 3.2" |
| June | 56°F | 77°F | 66°F | 3.6" |
| July | 61°F | 81°F | 71°F | 4.0" |
| August | 60°F | 80°F | 69°F | 3.3" |
| September | 53°F | 74°F | 63°F | 3.1" |
| October | 43°F | 62°F | 52°F | 2.5" |
| November | 33°F | 49°F | 41°F | 2.9" |
| December | 24°F | 37°F | 30°F | 3.0" |
| Index | Marysville | 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. |
| Emmett, MI | 256 | 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% |
| Port Huron, MI | 28,918 | 56 | 12.0% |
| Marysville, MI | 9,695 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Croydon, PA | 9,693 | 41 | 18.0% |
| Keansburg, NJ | 9,697 | 51 | 2.0% |
| Villas, NJ | 9,697 | 40 | 20.0% |
| Little River, SC | 9,692 | 34 | 32.0% |
| Rockcreek, OR | 9,698 | 38 | 24.0% |
| Marysville, MI | 9,695 | 56 | 12.0% |
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