| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 25°F | 4.6" |
| February | 15°F | 31°F | 23°F | 2.8" |
| March | 26°F | 44°F | 35°F | 2.1" |
| April | 37°F | 59°F | 47°F | 2.1" |
| May | 47°F | 70°F | 58°F | 4.9" |
| June | 61°F | 83°F | 72°F | 4.7" |
| July | 62°F | 84°F | 73°F | 3.6" |
| August | 63°F | 83°F | 73°F | 4.5" |
| September | 55°F | 77°F | 66°F | 8.9" |
| October | 47°F | 65°F | 55°F | 2.4" |
| November | 32°F | 48°F | 40°F | 4.2" |
| December | 21°F | 31°F | 26°F | 2.8" |
| Index | Pontiac | Michigan | National |
| Air quality index | 56 | 69 | 42 |
| Pollution index | 30,180,300 | 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 | 0.030% |
| Benzene | 0.390% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.130% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Leonard, MI | 343 | 38 | 24.0% |
| Lake Orion, MI | 3,143 | 38 | 24.0% |
| Ortonville, MI | 1,334 | 38 | 24.0% |
| Oxford, MI | 3,542 | 38 | 24.0% |
| Village of Clarkston, MI | 818 | 38 | 24.0% |
| Pontiac, MI | 59,714 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Woodland, CA | 59,759 | 52 | 4.0% |
| Blainville, QC | 59,647 | n/a | |
| Owensboro, KY | 59,796 | 43 | 14.0% |
| Cupertino, CA | 59,799 | 43 | 14.0% |
| West Allis, WI | 59,861 | 44 | 12.0% |
| Pontiac, MI | 59,714 | 56 | 12.0% |
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