| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 65°F | 53°F | 10.2" |
| February | 49°F | 70°F | 58°F | 7.3" |
| March | 56°F | 74°F | 64°F | 10.7" |
| April | 60°F | 80°F | 69°F | 12.3" |
| May | 65°F | 82°F | 73°F | 13.0" |
| June | 72°F | 87°F | 78°F | 9.4" |
| July | 73°F | 91°F | 81°F | 5.5" |
| August | 72°F | 91°F | 80°F | 16.1" |
| September | 67°F | 89°F | 77°F | 5.4" |
| October | 58°F | 83°F | 69°F | 15.2" |
| November | 53°F | 74°F | 62°F | 9.7" |
| December | 47°F | 65°F | 55°F | 10.6" |
| Index | Leonville | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 3,383,350 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 85 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Carencro, LA | 9,636 | 41 | 18.0% |
| Ossun, LA | 2,311 | 41 | 18.0% |
| Church Point, LA | 4,542 | 41 | 18.0% |
| Port Barre, LA | 1,666 | 41 | 18.0% |
| Cecilia, LA | 1,372 | 41 | 18.0% |
| Leonville, LA | 2,171 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Anza, CA | 2,171 | 89 | 78.0% |
| Cumberland, KY | 2,171 | 45 | 10.0% |
| Benton, LA | 2,171 | 39 | 22.0% |
| Springfield, MN | 2,171 | 32 | 36.0% |
| Burin, NL | 2,171 | n/a | |
| Leonville, LA | 2,171 | 41 | 18.0% |