| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 25°F | 4.6" |
| February | 15°F | 31°F | 23°F | 2.8" |
| March | 26°F | 44°F | 35°F | 2.1" |
| April | 37°F | 59°F | 47°F | 2.1" |
| May | 47°F | 70°F | 58°F | 4.9" |
| June | 61°F | 83°F | 72°F | 4.7" |
| July | 62°F | 84°F | 73°F | 3.6" |
| August | 63°F | 83°F | 73°F | 4.5" |
| September | 55°F | 77°F | 66°F | 8.9" |
| October | 47°F | 65°F | 55°F | 2.4" |
| November | 32°F | 48°F | 40°F | 4.2" |
| December | 21°F | 31°F | 26°F | 2.8" |
| Index | Ortonville | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 449,908 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 282 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Attica, MI | 915 | 38 | 24.0% |
| Lapeer, MI | 8,626 | 38 | 24.0% |
| Metamora, MI | 664 | 38 | 24.0% |
| Holly, MI | 6,151 | 38 | 24.0% |
| Burton, MI | 28,598 | 38 | 24.0% |
| Ortonville, MI | 1,334 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Elmore, AL | 1,334 | 52 | 4.0% |
| Des Arc, AR | 1,334 | 45 | 10.0% |
| Kamiah, ID | 1,334 | 29 | 42.0% |
| Cole Camp, MO | 1,334 | 39 | 22.0% |
| Stamford, NY | 1,334 | 37 | 26.0% |
| Ortonville, MI | 1,334 | 38 | 24.0% |
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