| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 2.0" |
| February | 18°F | 36°F | 26°F | 1.7" |
| March | 28°F | 48°F | 37°F | 2.5" |
| April | 38°F | 63°F | 50°F | 3.2" |
| May | 48°F | 74°F | 61°F | 4.0" |
| June | 58°F | 83°F | 71°F | 3.6" |
| July | 62°F | 87°F | 74°F | 3.6" |
| August | 61°F | 85°F | 73°F | 3.4" |
| September | 54°F | 78°F | 65°F | 3.0" |
| October | 43°F | 65°F | 53°F | 2.5" |
| November | 32°F | 52°F | 42°F | 2.6" |
| December | 24°F | 39°F | 31°F | 2.1" |
| Index | Northville | Michigan | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 180,667 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ypsilanti, MI | 20,792 | 40 | 20.0% |
| Milford, MI | 6,502 | 40 | 20.0% |
| Barton Hills, MI | 389 | 40 | 20.0% |
| Novi, MI | 60,439 | 40 | 20.0% |
| Whitmore Lake, MI | 8,010 | 40 | 20.0% |
| Northville, MI | 5,968 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Otis Orchards-East Farms, WA | 5,968 | 43 | 14.0% |
| Ocean City, FL | 5,969 | 31 | 38.0% |
| Cocoa West, FL | 5,966 | 36 | 28.0% |
| Gateway, AK | 5,965 | 31 | 38.0% |
| Fountainhead-Orchard Hills, MD | 5,964 | 40 | 20.0% |
| Northville, MI | 5,968 | 40 | 20.0% |
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