| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 62°F | 49°F | 5.7" |
| February | 42°F | 65°F | 52°F | 5.2" |
| March | 49°F | 72°F | 59°F | 6.1" |
| April | 55°F | 79°F | 66°F | 4.3" |
| May | 62°F | 84°F | 72°F | 4.7" |
| June | 70°F | 91°F | 79°F | 3.7" |
| July | 71°F | 91°F | 80°F | 6.4" |
| August | 72°F | 92°F | 80°F | 6.5" |
| September | 67°F | 88°F | 76°F | 4.5" |
| October | 56°F | 80°F | 67°F | 3.6" |
| November | 46°F | 70°F | 57°F | 3.1" |
| December | 43°F | 63°F | 52°F | 6.5" |
| Index | Roseland | Louisiana | National |
| Air quality index | 30 | 106 | 42 |
| Pollution index | 498,493 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 117 |
| Days with good air quality | 104 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.004% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Amite City, LA | 4,459 | 30 | 40.0% |
| Montpelier, LA | 323 | 30 | 40.0% |
| Greensburg, LA | 1,018 | 30 | 40.0% |
| Natalbany, LA | 2,847 | 30 | 40.0% |
| Independence, LA | 2,578 | 30 | 40.0% |
| Roseland, LA | 1,186 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Sand Point, AK | 1,186 | 31 | 38.0% |
| Royalton, MN | 1,186 | 32 | 36.0% |
| Boley, OK | 1,186 | 36 | 28.0% |
| North Apollo, PA | 1,186 | 38 | 24.0% |
| Wayne, WV | 1,186 | 42 | 16.0% |
| Roseland, LA | 1,186 | 30 | 40.0% |
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