| 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 | Ypsilanti | 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. |
| Carleton, MI | 2,527 | 1 | 98.0% |
| Saline, MI | 9,563 | 40 | 20.0% |
| Barton Hills, MI | 400 | 40 | 20.0% |
| Whitmore Lake, MI | 8,299 | 40 | 20.0% |
| Belleville, MI | 4,027 | 40 | 20.0% |
| Ypsilanti, MI | 21,227 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Palisades Park, NJ | 21,216 | 51 | 2.0% |
| Palm Valley, FL | 21,243 | 43 | 14.0% |
| Forest Lake, MN | 21,199 | 46 | 8.0% |
| Suwanee, GA | 21,257 | 37 | 26.0% |
| Esquimalt, BC | 21,191 | n/a | |
| Ypsilanti, MI | 21,227 | 40 | 20.0% |