| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 28°F | 21°F | 2.1" |
| February | 13°F | 28°F | 20°F | 1.8" |
| March | 22°F | 38°F | 29°F | 1.5" |
| April | 31°F | 49°F | 39°F | 2.7" |
| May | 41°F | 62°F | 50°F | 3.1" |
| June | 49°F | 70°F | 59°F | 3.9" |
| July | 56°F | 77°F | 66°F | 3.0" |
| August | 57°F | 76°F | 66°F | 3.0" |
| September | 51°F | 70°F | 60°F | 3.9" |
| October | 41°F | 57°F | 49°F | 4.3" |
| November | 31°F | 45°F | 38°F | 3.2" |
| December | 19°F | 33°F | 26°F | 2.9" |
| Index | Chatham | Michigan | National |
| Air quality index | 8 | 69 | 42 |
| Pollution index | 4,798,410 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 59 |
| Days with good air quality | 59 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Munising, MI | 1,991 | 8 | 84.0% |
| Chatham, MI | 153 | 8 | 84.0% |
| City | Population | Air Quality Index | National Avg. |
| Powhatan, AR | 153 | 45 | 10.0% |
| Hard Rock, AZ | 153 | 45 | 10.0% |
| Amador City, CA | 153 | 52 | 4.0% |
| Pine Flat, CA | 153 | 67 | 34.0% |
| Morriston, FL | 153 | 38 | 24.0% |
| Chatham, MI | 153 | 8 | 84.0% |
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