| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 24°F | 4.0" |
| February | 17°F | 35°F | 26°F | 2.3" |
| March | 27°F | 45°F | 35°F | 2.8" |
| April | 38°F | 61°F | 49°F | 4.7" |
| May | 49°F | 72°F | 60°F | 5.0" |
| June | 59°F | 81°F | 70°F | 7.1" |
| July | 61°F | 81°F | 71°F | 5.8" |
| August | 61°F | 81°F | 71°F | 8.7" |
| September | 55°F | 77°F | 66°F | 5.9" |
| October | 46°F | 65°F | 55°F | 5.0" |
| November | 33°F | 50°F | 41°F | 4.9" |
| December | 23°F | 37°F | 30°F | 2.2" |
| Index | Grand Beach | Michigan | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 4,961,970 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 305 |
| Days with moderate air quality | 55 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| La Porte, IN | 21,328 | 37 | 26.0% |
| Rolling Prairie, IN | 408 | 37 | 26.0% |
| Michigan City, IN | 31,191 | 37 | 26.0% |
| Michiana, MI | 255 | 37 | 26.0% |
| Shorewood-Tower Hills-Harbert, MI | 1,501 | 37 | 26.0% |
| Grand Beach, MI | 292 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Idledale, CO | 292 | 58 | 16.0% |
| Baldwin, IL | 292 | 54 | 8.0% |
| Campbell Hill, IL | 292 | 43 | 14.0% |
| Joy, IL | 292 | 32 | 36.0% |
| Vallonia, IN | 292 | 35 | 30.0% |
| Grand Beach, MI | 292 | 37 | 26.0% |
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