| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 64°F | 52°F | 10.7" |
| February | 46°F | 69°F | 56°F | 9.6" |
| March | 52°F | 74°F | 62°F | 9.5" |
| April | 59°F | 80°F | 69°F | 12.2" |
| May | 63°F | 84°F | 73°F | 18.2" |
| June | 72°F | 89°F | 80°F | 8.0" |
| July | 73°F | 91°F | 81°F | 7.0" |
| August | 73°F | 91°F | 80°F | 13.6" |
| September | 70°F | 89°F | 78°F | 8.0" |
| October | 59°F | 82°F | 69°F | 9.8" |
| November | 49°F | 73°F | 60°F | 6.0" |
| December | 47°F | 68°F | 56°F | 6.6" |
| Index | Wallace | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 2,337,990 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 272 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Reserve, LA | 8,721 | 30 | 40.0% |
| Garyville, LA | 2,022 | 30 | 40.0% |
| Laplace, LA | 29,883 | 30 | 40.0% |
| Gramercy, LA | 3,352 | 41 | 18.0% |
| North Vacherie, LA | 1,686 | 41 | 18.0% |
| Wallace, LA | 1,276 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Del Rey, CA | 1,276 | 60 | 20.0% |
| Julesburg, CO | 1,276 | 19 | 62.0% |
| Moreland, ID | 1,276 | 27 | 46.0% |
| Trafalgar, IN | 1,276 | 41 | 18.0% |
| Conehatta, MS | 1,276 | 36 | 28.0% |
| Wallace, LA | 1,276 | 41 | 18.0% |