| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 5.1" |
| February | 17°F | 32°F | 24°F | 2.5" |
| March | 28°F | 48°F | 37°F | 2.2" |
| April | 38°F | 62°F | 50°F | 2.7" |
| May | 49°F | 73°F | 61°F | 4.9" |
| June | 62°F | 84°F | 73°F | 9.1" |
| July | 61°F | 86°F | 73°F | 7.0" |
| August | 63°F | 84°F | 73°F | 8.3" |
| September | 55°F | 79°F | 67°F | 3.0" |
| October | 46°F | 67°F | 56°F | 4.5" |
| November | 33°F | 50°F | 41°F | 3.3" |
| December | 22°F | 32°F | 28°F | 2.2" |
| Index | Marcellus | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,797,130 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 312 |
| Days with moderate air quality | 50 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Constantine, MI | 2,222 | 37 | 26.0% |
| Vandalia, MI | 387 | 37 | 26.0% |
| Paw Paw, MI | 3,416 | 38 | 24.0% |
| Centreville, MI | 1,159 | 38 | 24.0% |
| Decatur, MI | 1,935 | 38 | 24.0% |
| Marcellus, MI | 1,140 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Towaoc, CO | 1,140 | 49 | 2.0% |
| Chadwicks, NY | 1,140 | 27 | 46.0% |
| Lakeview, OH | 1,140 | 39 | 22.0% |
| Fountain Green, UT | 1,140 | 46 | 8.0% |
| Rison, AR | 1,139 | 32 | 36.0% |
| Marcellus, MI | 1,140 | 38 | 24.0% |
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