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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 64°F | 52°F | 4.7" |
| February | 44°F | 67°F | 54°F | 4.5" |
| March | 51°F | 73°F | 62°F | 4.5" |
| April | 58°F | 79°F | 68°F | 5.2" |
| May | 64°F | 85°F | 74°F | 5.1" |
| June | 72°F | 91°F | 81°F | 5.2" |
| July | 74°F | 91°F | 81°F | 6.9" |
| August | 74°F | 91°F | 81°F | 8.3" |
| September | 69°F | 88°F | 77°F | 5.2" |
| October | 57°F | 81°F | 68°F | 3.3" |
| November | 47°F | 72°F | 58°F | 2.5" |
| December | 46°F | 66°F | 55°F | 5.6" |
| Index | Pearl River | Louisiana | National |
| Air quality index | 45 | 106 | 42 |
| Pollution index | 4,700,710 | 2,526,475 | 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 | 0.003% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hide-A-Way Lake, MS | 2,217 | 42 | 16.0% |
| Pearlington, MS | 803 | 45 | 10.0% |
| Slidell, LA | 27,782 | 45 | 10.0% |
| Picayune, MS | 11,016 | 45 | 10.0% |
| Eden Isle, LA | 8,103 | 45 | 10.0% |
| Pearl River, LA | 2,618 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Indian Springs Village, AL | 2,618 | 53 | 6.0% |
| Merkel, TX | 2,618 | 33 | 34.0% |
| Ruleville, MS | 2,617 | 43 | 14.0% |
| Freemansburg, PA | 2,617 | 42 | 16.0% |
| Homestead Valley, CA | 2,619 | 89 | 78.0% |
| Pearl River, LA | 2,618 | 45 | 10.0% |
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