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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 35°F | 28°F | 5.5" |
| February | 19°F | 33°F | 26°F | 1.5" |
| March | 28°F | 46°F | 37°F | 2.3" |
| April | 36°F | 60°F | 47°F | 3.5" |
| May | 46°F | 71°F | 58°F | 4.0" |
| June | 58°F | 81°F | 70°F | 4.1" |
| July | 59°F | 83°F | 71°F | 7.1" |
| August | 59°F | 81°F | 71°F | 13.5" |
| September | 53°F | 78°F | 65°F | 6.2" |
| October | 45°F | 66°F | 56°F | 4.1" |
| November | 33°F | 51°F | 42°F | 3.6" |
| December | 24°F | 34°F | 29°F | 2.4" |
| Index | South Haven | 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. |
| Fennville, MI | 1,939 | 38 | 24.0% |
| Lawrence, MI | 918 | 38 | 24.0% |
| Lake Michigan Beach, MI | 1,110 | 39 | 22.0% |
| Breedsville, MI | 369 | 39 | 22.0% |
| Bangor, MI | 2,135 | 39 | 22.0% |
| South Haven, MI | 4,340 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Tontitown, AR | 4,341 | 44 | 12.0% |
| Garwood, NJ | 4,341 | 51 | 2.0% |
| Glassport, PA | 4,338 | 56 | 12.0% |
| Jourdanton, TX | 4,338 | 49 | 2.0% |
| Berryville, VA | 4,338 | 38 | 24.0% |
| South Haven, MI | 4,340 | 39 | 22.0% |