| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 30°F | 22°F | 3.3" |
| February | 12°F | 30°F | 21°F | 2.0" |
| March | 22°F | 39°F | 30°F | 4.6" |
| April | 36°F | 57°F | 46°F | 4.2" |
| May | 47°F | 70°F | 58°F | 3.2" |
| June | 56°F | 78°F | 67°F | 6.0" |
| July | 59°F | 79°F | 69°F | 6.4" |
| August | 56°F | 78°F | 67°F | 7.0" |
| September | 49°F | 73°F | 60°F | 1.5" |
| October | 43°F | 61°F | 51°F | 4.4" |
| November | 29°F | 43°F | 36°F | 3.7" |
| December | 22°F | 34°F | 28°F | 0.7" |
| Index | Capac | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 30,180,300 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 282 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Attica, MI | 915 | 38 | 24.0% |
| Almont, MI | 2,802 | 38 | 24.0% |
| Leonard, MI | 343 | 38 | 24.0% |
| Imlay City, MI | 3,585 | 38 | 24.0% |
| Brown City, MI | 1,190 | 38 | 24.0% |
| Capac, MI | 1,858 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Hopewell, NJ | 1,857 | 41 | 18.0% |
| Port Henry, NY | 1,859 | 37 | 26.0% |
| San Augustine, TX | 1,857 | 39 | 22.0% |
| Waterbury, VT | 1,857 | 37 | 26.0% |
| Fairlea, WV | 1,857 | 41 | 18.0% |
| Capac, MI | 1,858 | 38 | 24.0% |
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