| 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 | Killian | Louisiana | National |
| Air quality index | 30 | 106 | 42 |
| Pollution index | 2,638,510 | 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 | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Livingston, LA | 1,880 | 30 | 40.0% |
| Natalbany, LA | 2,847 | 30 | 40.0% |
| Ponchatoula, LA | 7,311 | 30 | 40.0% |
| Albany, LA | 1,300 | 30 | 40.0% |
| Hammond, LA | 20,557 | 30 | 40.0% |
| Killian, LA | 1,852 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Smoke Rise, AL | 1,852 | 53 | 6.0% |
| Davenport, WA | 1,852 | 43 | 14.0% |
| Saint Stephen, NB | 1,852 | n/a | |
| Nipissing, Unorganized, North Part, ON | 1,852 | n/a | |
| Kingstown, MD | 1,853 | 42 | 16.0% |
| Killian, LA | 1,852 | 30 | 40.0% |
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