| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 3.7" |
| February | 17°F | 33°F | 25°F | 3.3" |
| March | 28°F | 47°F | 36°F | 4.8" |
| April | 38°F | 60°F | 48°F | 4.4" |
| May | 49°F | 71°F | 60°F | 6.1" |
| June | 58°F | 79°F | 68°F | 1.9" |
| July | 62°F | 82°F | 72°F | 6.8" |
| August | 60°F | 80°F | 69°F | 9.4" |
| September | 53°F | 74°F | 63°F | 5.5" |
| October | 42°F | 62°F | 51°F | 8.0" |
| November | 32°F | 49°F | 40°F | 4.3" |
| December | 24°F | 36°F | 30°F | 2.3" |
| Index | Marshall | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 8,357,230 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 312 |
| Days with moderate air quality | 50 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.090% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Bellevue, MI | 1,152 | 36 | 28.0% |
| Olivet, MI | 1,675 | 36 | 28.0% |
| Albion, MI | 8,380 | 36 | 28.0% |
| Springport, MI | 848 | 36 | 28.0% |
| Homer, MI | 1,550 | 38 | 24.0% |
| Marshall, MI | 6,947 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Oakdale, NY | 6,947 | 43 | 14.0% |
| Asbestos, QC | 6,948 | n/a | |
| Batesville, IN | 6,945 | 41 | 18.0% |
| Plymouth, MA | 6,949 | 36 | 28.0% |
| Selma, NC | 6,950 | 40 | 20.0% |
| Marshall, MI | 6,947 | 38 | 24.0% |
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