| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 35°F | 26°F | 2.4" |
| February | 18°F | 36°F | 27°F | 2.3" |
| March | 27°F | 49°F | 37°F | 2.7" |
| April | 38°F | 63°F | 50°F | 3.2" |
| May | 49°F | 74°F | 61°F | 3.8" |
| June | 59°F | 83°F | 71°F | 3.7" |
| July | 63°F | 86°F | 74°F | 4.0" |
| August | 62°F | 84°F | 73°F | 4.5" |
| September | 55°F | 78°F | 65°F | 3.3" |
| October | 44°F | 65°F | 54°F | 2.5" |
| November | 33°F | 52°F | 42°F | 3.0" |
| December | 24°F | 39°F | 31°F | 2.9" |
| Index | Westland | 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. |
| Gibraltar, MI | 4,546 | 1 | 98.0% |
| Woodhaven, MI | 12,501 | 1 | 98.0% |
| Northville, MI | 5,968 | 40 | 20.0% |
| Ypsilanti, MI | 20,792 | 40 | 20.0% |
| Belleville, MI | 3,879 | 40 | 20.0% |
| Westland, MI | 81,713 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Loveland, CO | 81,774 | 48 | 4.0% |
| Atascocita, TX | 81,860 | 52 | 4.0% |
| Kawartha Lakes, ON | 81,906 | n/a | |
| Cicero, IL | 81,471 | 55 | 10.0% |
| The Villages, FL | 81,444 | 38 | 24.0% |
| Westland, MI | 81,713 | 56 | 12.0% |
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