| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 1.6" |
| February | 17°F | 34°F | 25°F | 1.5" |
| March | 28°F | 47°F | 37°F | 1.8" |
| April | 38°F | 61°F | 49°F | 2.9" |
| May | 49°F | 73°F | 60°F | 3.0" |
| June | 58°F | 81°F | 69°F | 3.5" |
| July | 61°F | 84°F | 73°F | 3.5" |
| August | 60°F | 82°F | 70°F | 2.9" |
| September | 53°F | 76°F | 64°F | 2.5" |
| October | 42°F | 64°F | 52°F | 2.0" |
| November | 32°F | 50°F | 40°F | 2.3" |
| December | 24°F | 38°F | 30°F | 2.0" |
| Index | Clinton | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,741,370 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Petersburg, MI | 1,178 | 1 | 98.0% |
| Napoleon, MI | 905 | 39 | 22.0% |
| Britton, MI | 631 | 39 | 22.0% |
| Clayton, MI | 267 | 39 | 22.0% |
| Tecumseh, MI | 8,361 | 39 | 22.0% |
| Clinton, MI | 2,885 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Marion, KY | 2,885 | 44 | 12.0% |
| Chincoteague, VA | 2,885 | 36 | 28.0% |
| Newton, IL | 2,884 | 40 | 20.0% |
| Cordaville, MA | 2,884 | 40 | 20.0% |
| Womelsdorf, PA | 2,886 | 42 | 16.0% |
| Clinton, MI | 2,885 | 39 | 22.0% |
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