| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 56°F | 45°F | 5.0" |
| February | 37°F | 58°F | 47°F | 4.7" |
| March | 46°F | 70°F | 57°F | 3.6" |
| April | 53°F | 77°F | 64°F | 5.4" |
| May | 62°F | 84°F | 72°F | 6.0" |
| June | 69°F | 91°F | 80°F | 2.4" |
| July | 71°F | 92°F | 81°F | 4.3" |
| August | 72°F | 94°F | 81°F | 3.3" |
| September | 66°F | 87°F | 75°F | 8.7" |
| October | 52°F | 77°F | 63°F | 5.9" |
| November | 44°F | 69°F | 55°F | 3.1" |
| December | 37°F | 59°F | 47°F | 5.5" |
| Index | Morgan City | Mississippi | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 1,165,390 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 270 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Sidon, MS | 322 | 33 | 34.0% |
| Cruger, MS | 346 | 33 | 34.0% |
| Tchula, MS | 1,997 | 33 | 34.0% |
| Greenwood, MS | 13,826 | 33 | 34.0% |
| Isola, MS | 770 | 43 | 14.0% |
| Morgan City, MS | 264 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Industry, CA | 264 | 72 | 44.0% |
| Crystal Lake, IA | 264 | 15 | 70.0% |
| Bliss, ID | 264 | 20 | 60.0% |
| Sweetwater, ID | 264 | 29 | 42.0% |
| Fenton, LA | 264 | 45 | 10.0% |
| Morgan City, MS | 264 | 43 | 14.0% |
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