| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 1.7" |
| February | 20°F | 35°F | 27°F | 1.6" |
| March | 29°F | 47°F | 37°F | 2.3" |
| April | 39°F | 61°F | 49°F | 3.0" |
| May | 50°F | 72°F | 61°F | 3.7" |
| June | 61°F | 81°F | 71°F | 3.2" |
| July | 65°F | 85°F | 75°F | 3.8" |
| August | 64°F | 83°F | 73°F | 4.4" |
| September | 57°F | 76°F | 66°F | 3.5" |
| October | 46°F | 63°F | 54°F | 1.9" |
| November | 34°F | 51°F | 42°F | 2.3" |
| December | 26°F | 38°F | 32°F | 2.1" |
| Index | Weatherby | Detroit | Michigan |
| Air quality index | 56 | 56 | 69 |
| Pollution index | 180,667 | 180,667 | 4,161,606 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 135 |
| Days with moderate air quality | 217 |
| Days w/ poor A.Q. for sensitive groups | 13 |
| 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. |
| Northville, MI | 5,968 | 40 | 20.0% |
| Belleville, MI | 3,879 | 40 | 20.0% |
| Plymouth, MI | 9,168 | 40 | 20.0% |
| Novi, MI | 60,439 | 40 | 20.0% |
| Wixom, MI | 13,970 | 40 | 20.0% |
| Detroit, MI | 672,351 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Nashville, TN | 667,070 | 45 | 10.0% |
| El Paso, TX | 679,879 | 53 | 6.0% |
| Boston, MA | 689,326 | 43 | 14.0% |
| Memphis, TN | 650,910 | 45 | 10.0% |
| Portland, OR | 650,380 | 38 | 24.0% |
| Detroit, MI | 672,351 | 56 | 12.0% |
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