| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 4.0" |
| February | 17°F | 33°F | 25°F | 3.0" |
| March | 27°F | 46°F | 36°F | 3.8" |
| April | 37°F | 59°F | 47°F | 4.8" |
| May | 48°F | 71°F | 59°F | 5.0" |
| June | 56°F | 79°F | 67°F | 5.7" |
| July | 60°F | 82°F | 71°F | 5.1" |
| August | 58°F | 80°F | 69°F | 6.6" |
| September | 52°F | 74°F | 62°F | 4.6" |
| October | 42°F | 62°F | 51°F | 6.6" |
| November | 32°F | 49°F | 40°F | 3.3" |
| December | 24°F | 36°F | 30°F | 2.2" |
| Index | Mulliken | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 8,357,230 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 330 |
| Days with moderate air quality | 35 |
| 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. |
| Potterville, MI | 2,731 | 36 | 28.0% |
| Grand Ledge, MI | 7,860 | 36 | 28.0% |
| Waverly, MI | 24,050 | 36 | 28.0% |
| Westphalia, MI | 808 | 36 | 28.0% |
| Vermontville, MI | 700 | 36 | 28.0% |
| Mulliken, MI | 589 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Schall Circle, FL | 589 | 36 | 28.0% |
| Albert City, IA | 589 | 35 | 30.0% |
| Grand Tower, IL | 589 | 43 | 14.0% |
| Camden, IN | 589 | 42 | 16.0% |
| River Bluff, KY | 589 | 49 | 2.0% |
| Mulliken, MI | 589 | 36 | 28.0% |
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