| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 64°F | 54°F | 4.1" |
| February | 48°F | 67°F | 57°F | 3.7" |
| March | 54°F | 73°F | 64°F | 3.8" |
| April | 60°F | 79°F | 70°F | 5.1" |
| May | 67°F | 84°F | 76°F | 6.4" |
| June | 73°F | 90°F | 81°F | 5.9" |
| July | 74°F | 90°F | 82°F | 5.9" |
| August | 75°F | 91°F | 82°F | 7.1" |
| September | 71°F | 88°F | 79°F | 3.9" |
| October | 61°F | 81°F | 70°F | 3.8" |
| November | 51°F | 73°F | 61°F | 2.6" |
| December | 47°F | 67°F | 56°F | 7.6" |
| Index | Violet | Louisiana | National |
| Air quality index | 45 | 106 | 50 |
| Pollution index | 2,751,420 | 2,540,283 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 116 |
| Days w/ poor A.Q. for sensitive groups | 22 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Barataria, LA | 1,008 | 45 | 10% |
| Gretna, LA | 17,832 | 45 | 10% |
| Marrero, LA | 31,454 | 45 | 10% |
| Poydras, LA | 2,394 | 45 | 10% |
| Woodmere, LA | 11,391 | 45 | 10% |
| Violet, LA | 5,621 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Hidden Valley Lake, CA | 5,618 | 31 | 38% |
| Coraopolis, PA | 5,617 | 56 | 12% |
| Swartz Creek, MI | 5,617 | 38 | 24% |
| Richwood, LA | 5,626 | 56 | 12% |
| Pevely, MO | 5,616 | 60 | 20% |
| Violet, LA | 5,621 | 45 | 10% |