| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 63°F | 55°F | 8.6" |
| February | 47°F | 64°F | 55°F | 5.6" |
| March | 54°F | 69°F | 62°F | 5.8" |
| April | 59°F | 75°F | 67°F | 23.1" |
| May | 67°F | 83°F | 76°F | 12.4" |
| June | 73°F | 88°F | 81°F | 8.5" |
| July | 76°F | 88°F | 82°F | 13.2" |
| August | 78°F | 91°F | 84°F | 6.8" |
| September | 73°F | 89°F | 81°F | 3.2" |
| October | 62°F | 80°F | 71°F | 12.1" |
| November | 54°F | 71°F | 62°F | 9.7" |
| December | 48°F | 65°F | 56°F | 8.8" |
| Index | D'Iberville | Mississippi | National |
| Air quality index | 42 | 40 | 42 |
| Pollution index | 414,728 | 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 | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gulf Park Estates, MS | 6,238 | 32 | 36.0% |
| Vancleave, MS | 4,934 | 32 | 36.0% |
| Ocean Springs, MS | 17,756 | 42 | 16.0% |
| Gulfport, MS | 71,660 | 42 | 16.0% |
| St. Martin, MS | 8,211 | 42 | 16.0% |
| D'Iberville, MS | 13,766 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Royse City, TX | 13,773 | 51 | 2.0% |
| Shepherdsville, KY | 13,757 | 49 | 2.0% |
| Fergus Falls, MN | 13,754 | 33 | 34.0% |
| St. Helens, OR | 13,779 | 18 | 64.0% |
| Lockhart, TX | 13,782 | 44 | 12.0% |
| D'Iberville, MS | 13,766 | 42 | 16.0% |
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