| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 64°F | 51°F | 4.4" |
| February | 43°F | 66°F | 54°F | 4.5" |
| March | 50°F | 73°F | 61°F | 4.1" |
| April | 56°F | 78°F | 67°F | 5.7" |
| May | 62°F | 84°F | 73°F | 5.4" |
| June | 70°F | 90°F | 79°F | 6.2" |
| July | 72°F | 91°F | 80°F | 6.6" |
| August | 73°F | 91°F | 80°F | 8.9" |
| September | 68°F | 88°F | 77°F | 5.8" |
| October | 56°F | 81°F | 67°F | 3.7" |
| November | 46°F | 72°F | 58°F | 2.7" |
| December | 44°F | 66°F | 54°F | 5.9" |
| Index | Grand Bay | Alabama | National |
| Air quality index | 32 | 37 | 42 |
| Pollution index | 630,582 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 330 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Escatawpa, MS | 2,958 | 32 | 36.0% |
| Moss Point, MS | 13,396 | 32 | 36.0% |
| Helena, MS | 794 | 32 | 36.0% |
| Pascagoula, MS | 21,732 | 32 | 36.0% |
| Hurley, MS | 1,279 | 32 | 36.0% |
| Grand Bay, AL | 3,829 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| New Hope, MS | 3,829 | 35 | 30.0% |
| Chilton, WI | 3,829 | 37 | 26.0% |
| Clyde, TX | 3,828 | 33 | 34.0% |
| Dana, NC | 3,830 | 44 | 12.0% |
| Saugerties, NY | 3,827 | 36 | 28.0% |
| Grand Bay, AL | 3,829 | 32 | 36.0% |
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