| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 33°F | 27°F | 3.1" |
| February | 21°F | 34°F | 27°F | 3.9" |
| March | 30°F | 46°F | 37°F | 5.1" |
| April | 41°F | 59°F | 49°F | 4.1" |
| May | 52°F | 70°F | 60°F | 4.8" |
| June | 62°F | 79°F | 70°F | 4.5" |
| July | 67°F | 83°F | 74°F | 4.7" |
| August | 65°F | 81°F | 73°F | 4.3" |
| September | 59°F | 74°F | 66°F | 5.3" |
| October | 47°F | 62°F | 54°F | 3.5" |
| November | 36°F | 49°F | 42°F | 7.2" |
| December | 28°F | 38°F | 32°F | 1.4" |
| Index | Flat Rock | Michigan | National |
| Air quality index | 1 | 69 | 42 |
| Pollution index | 1,741,370 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 355 |
| Days with moderate air quality | 4 |
| 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. |
| Gibraltar, MI | 4,546 | 1 | 98.0% |
| Carleton, MI | 2,449 | 1 | 98.0% |
| Maybee, MI | 613 | 1 | 98.0% |
| West Monroe, MI | 3,261 | 1 | 98.0% |
| South Rockwood, MI | 1,903 | 1 | 98.0% |
| Flat Rock, MI | 9,974 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| Morden, MB | 9,973 | n/a | |
| Watervliet, NY | 9,976 | 37 | 26.0% |
| Red Bank, SC | 9,971 | 43 | 14.0% |
| Lambertville, MI | 9,970 | 40 | 20.0% |
| Friendly, MD | 9,984 | 47 | 6.0% |
| Flat Rock, MI | 9,974 | 1 | 98.0% |
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