| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 66°F | 54°F | 10.3" |
| February | 47°F | 71°F | 59°F | 5.5" |
| March | 56°F | 75°F | 65°F | 10.4" |
| April | 58°F | 79°F | 69°F | 16.1" |
| May | 64°F | 83°F | 73°F | 20.0" |
| June | 71°F | 90°F | 80°F | 11.6" |
| July | 74°F | 93°F | 83°F | 6.7" |
| August | 73°F | 92°F | 81°F | 12.4" |
| September | 68°F | 89°F | 78°F | 8.8" |
| October | 58°F | 83°F | 70°F | 8.6" |
| November | 51°F | 75°F | 62°F | 8.3" |
| December | 48°F | 68°F | 57°F | 12.2" |
| Index | Pearlington | Mississippi | National |
| Air quality index | 45 | 40 | 42 |
| Pollution index | 1,435,130 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 229 |
| Days with moderate air quality | 134 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| Waveland, MS | 6,352 | 42 | 16.0% |
| Bay St. Louis, MS | 13,539 | 42 | 16.0% |
| Kiln, MS | 2,462 | 42 | 16.0% |
| Pearl River, LA | 2,618 | 45 | 10.0% |
| Slidell, LA | 27,782 | 45 | 10.0% |
| Pearlington, MS | 803 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Drayton, ND | 803 | 33 | 34.0% |
| Longport, NJ | 803 | 37 | 26.0% |
| Bégin, QC | 803 | n/a | |
| Temagami, ON | 803 | n/a | |
| Wadley, AL | 802 | 38 | 24.0% |
| Pearlington, MS | 803 | 45 | 10.0% |
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