| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.0" |
| February | 18°F | 34°F | 26°F | 1.2" |
| March | 27°F | 47°F | 37°F | 2.0" |
| April | 38°F | 61°F | 49°F | 3.1" |
| May | 49°F | 72°F | 60°F | 3.6" |
| June | 59°F | 81°F | 70°F | 3.9" |
| July | 62°F | 84°F | 73°F | 4.7" |
| August | 61°F | 82°F | 71°F | 3.4" |
| September | 54°F | 75°F | 64°F | 3.4" |
| October | 43°F | 63°F | 52°F | 3.9" |
| November | 32°F | 50°F | 41°F | 2.2" |
| December | 23°F | 37°F | 30°F | 1.6" |
| Index | Delton | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 8,357,230 | 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 | 0.070% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.090% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Comstock Northwest, MI | 5,999 | 38 | 24.0% |
| Parchment, MI | 1,887 | 38 | 24.0% |
| Dowling, MI | 399 | 38 | 24.0% |
| Augusta, MI | 842 | 38 | 24.0% |
| Eastwood, MI | 5,675 | 38 | 24.0% |
| Delton, MI | 596 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Thornton, AR | 596 | 35 | 30.0% |
| Woodson, AR | 596 | 45 | 10.0% |
| Allensworth, CA | 596 | 66 | 32.0% |
| Dudley, GA | 596 | 38 | 24.0% |
| Radcliffe, IA | 596 | 37 | 26.0% |
| Delton, MI | 596 | 38 | 24.0% |
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