| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.5" |
| February | 17°F | 34°F | 26°F | 2.0" |
| March | 25°F | 47°F | 36°F | 2.5" |
| April | 36°F | 62°F | 48°F | 4.5" |
| May | 47°F | 73°F | 60°F | 3.3" |
| June | 57°F | 82°F | 70°F | 4.8" |
| July | 61°F | 85°F | 73°F | 4.3" |
| August | 60°F | 83°F | 71°F | 3.8" |
| September | 52°F | 77°F | 64°F | 3.2" |
| October | 42°F | 64°F | 52°F | 4.9" |
| November | 32°F | 51°F | 41°F | 2.7" |
| December | 24°F | 38°F | 30°F | 2.5" |
| Index | Freeport | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 8,357,230 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 298 |
| Days with moderate air quality | 67 |
| 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. |
| Vermontville, MI | 700 | 36 | 28.0% |
| Woodland, MI | 530 | 36 | 28.0% |
| Nashville, MI | 1,461 | 36 | 28.0% |
| Caledonia, MI | 1,442 | 38 | 24.0% |
| Ionia, MI | 11,178 | 38 | 24.0% |
| Freeport, MI | 581 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Graham, GA | 581 | 26 | 48.0% |
| Junction City, IL | 581 | 43 | 14.0% |
| Benham, KY | 581 | 45 | 10.0% |
| Randall, MN | 581 | 29 | 42.0% |
| Morrisville, MO | 581 | 39 | 22.0% |
| Freeport, MI | 581 | 38 | 24.0% |
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