| 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 | Harvey | Louisiana | National |
| Air quality index | 45 | 106 | 42 |
| Pollution index | 3,881,730 | 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 | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Barataria, LA | 1,027 | 45 | 10.0% |
| Harahan, LA | 9,293 | 45 | 10.0% |
| Marrero, LA | 31,751 | 45 | 10.0% |
| Westwego, LA | 8,411 | 45 | 10.0% |
| Lafourche Crossing, LA | 1,982 | 45 | 10.0% |
| Harvey, LA | 20,992 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Kuna, ID | 20,985 | 36 | 28.0% |
| Holiday, FL | 21,006 | 43 | 14.0% |
| Eustis, FL | 21,010 | 37 | 26.0% |
| Pleasant Prairie, WI | 20,969 | 39 | 22.0% |
| Chambersburg, PA | 21,017 | 36 | 28.0% |
| Harvey, LA | 20,992 | 45 | 10.0% |
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