| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 20°F | 1.4" |
| February | 10°F | 27°F | 19°F | 1.0" |
| March | 19°F | 40°F | 29°F | 1.5" |
| April | 31°F | 53°F | 41°F | 3.1" |
| May | 43°F | 68°F | 55°F | 3.1" |
| June | 52°F | 75°F | 63°F | 3.8" |
| July | 56°F | 80°F | 68°F | 2.2" |
| August | 55°F | 77°F | 66°F | 3.4" |
| September | 48°F | 70°F | 59°F | 4.2" |
| October | 38°F | 57°F | 47°F | 3.8" |
| November | 28°F | 43°F | 35°F | 2.5" |
| December | 18°F | 31°F | 25°F | 1.6" |
| Index | Lewiston | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,346,710 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 247 |
| Days with good air quality | 232 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Mio, MI | 1,590 | 36 | 28.0% |
| Atlanta, MI | 647 | 36 | 28.0% |
| Lewiston, MI | 888 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Shelter Cove, CA | 888 | 27 | 46.0% |
| Troy, ID | 888 | 10 | 80.0% |
| Vassar, KS | 888 | 41 | 18.0% |
| Finzel, MD | 888 | 36 | 28.0% |
| Wellston, OK | 888 | 36 | 28.0% |
| Lewiston, MI | 888 | 36 | 28.0% |