| 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 | Douglas | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,797,130 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 276 |
| Days with good air quality | 227 |
| Days with moderate air quality | 45 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| 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. |
| Fennville, MI | 1,939 | 38 | 24.0% |
| Holland, MI | 33,329 | 38 | 24.0% |
| Saugatuck, MI | 899 | 38 | 24.0% |
| Zeeland, MI | 5,540 | 38 | 24.0% |
| Beechwood, MI | 2,966 | 38 | 24.0% |
| Douglas, MI | 1,107 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Royalton, IL | 1,107 | 43 | 14.0% |
| Harbor Springs, MI | 1,107 | 36 | 28.0% |
| Adair Village, OR | 1,107 | 28 | 44.0% |
| Kykotsmovi Village, AZ | 1,106 | 45 | 10.0% |
| Louisville, IL | 1,106 | 40 | 20.0% |
| Douglas, MI | 1,107 | 38 | 24.0% |
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