| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 63°F | 52°F | 4.5" |
| February | 47°F | 66°F | 56°F | 5.2" |
| March | 54°F | 73°F | 63°F | 5.9" |
| April | 61°F | 79°F | 70°F | 7.4" |
| May | 66°F | 84°F | 75°F | 5.2" |
| June | 74°F | 90°F | 82°F | 8.4" |
| July | 75°F | 92°F | 83°F | 7.0" |
| August | 75°F | 92°F | 83°F | 8.5" |
| September | 71°F | 89°F | 79°F | 4.2" |
| October | 59°F | 81°F | 70°F | 2.8" |
| November | 50°F | 72°F | 60°F | 2.7" |
| December | 46°F | 66°F | 55°F | 5.0" |
| Index | Bay St. Louis | Mississippi | National |
| Air quality index | 42 | 40 | 42 |
| Pollution index | 1,435,130 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 264 |
| Days with moderate air quality | 100 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Diamondhead, MS | 8,076 | 42 | 16.0% |
| Lyman, MS | 2,303 | 42 | 16.0% |
| Henderson Point, MS | 276 | 42 | 16.0% |
| Pass Christian, MS | 6,079 | 42 | 16.0% |
| Kiln, MS | 2,462 | 42 | 16.0% |
| Bay St. Louis, MS | 13,539 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Federal Heights, CO | 13,537 | 58 | 16.0% |
| Ridge, NY | 13,537 | 43 | 14.0% |
| St. James, NY | 13,533 | 43 | 14.0% |
| Pottsville, PA | 13,549 | 42 | 16.0% |
| Central Elgin, ON | 13,549 | n/a | |
| Bay St. Louis, MS | 13,539 | 42 | 16.0% |
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