| 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 | Troy | Michigan | National |
| Air quality index | 56 | 69 | 42 |
| Pollution index | 180,667 | 4,161,606 | 2,726,193 |
| 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. |
| Lake Orion, MI | 3,143 | 38 | 24.0% |
| Village of Clarkston, MI | 818 | 38 | 24.0% |
| Grosse Pointe Woods, MI | 15,409 | 56 | 12.0% |
| Livonia, MI | 93,970 | 56 | 12.0% |
| Franklin, MI | 2,877 | 56 | 12.0% |
| Troy, MI | 84,051 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Merced, CA | 84,081 | 48 | 4.0% |
| Mission, TX | 83,796 | 42 | 16.0% |
| Santa Fe, NM | 84,418 | 44 | 12.0% |
| Alhambra, CA | 84,509 | 72 | 44.0% |
| Redwood City, CA | 84,518 | 43 | 14.0% |
| Troy, MI | 84,051 | 56 | 12.0% |
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