| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 2.1" |
| February | 20°F | 34°F | 27°F | 1.9" |
| March | 29°F | 47°F | 37°F | 2.5" |
| April | 39°F | 60°F | 49°F | 4.4" |
| May | 49°F | 72°F | 60°F | 3.9" |
| June | 59°F | 80°F | 69°F | 4.1" |
| July | 62°F | 83°F | 73°F | 3.6" |
| August | 61°F | 81°F | 71°F | 3.5" |
| September | 54°F | 76°F | 64°F | 2.9" |
| October | 44°F | 63°F | 53°F | 5.0" |
| November | 35°F | 51°F | 42°F | 2.8" |
| December | 26°F | 39°F | 32°F | 2.5" |
| Index | Allegan | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,797,130 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 185 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality |
| 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. |
| Parchment, MI | 1,887 | 38 | 24.0% |
| Fennville, MI | 1,939 | 38 | 24.0% |
| Otsego, MI | 3,980 | 39 | 22.0% |
| Bloomingdale, MI | 670 | 39 | 22.0% |
| Plainwell, MI | 3,799 | 39 | 22.0% |
| Allegan, MI | 5,017 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| White Hall, AR | 5,017 | 45 | 10.0% |
| South Haven, IN | 5,017 | 37 | 26.0% |
| Central Kootenay B, BC | 5,017 | n/a | |
| Samsula-Spruce Creek, FL | 5,016 | 37 | 26.0% |
| Wapato, WA | 5,018 | 38 | 24.0% |
| Allegan, MI | 5,017 | 39 | 22.0% |
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