| 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 | Palmetto | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 2,459,320 | 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 | 0.050% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.050% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Washington, LA | 860 | 41 | 18.0% |
| Krotz Springs, LA | 732 | 41 | 18.0% |
| Melville, LA | 907 | 41 | 18.0% |
| Opelousas, LA | 16,687 | 41 | 18.0% |
| Port Barre, LA | 1,619 | 41 | 18.0% |
| Palmetto, LA | 151 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Kobuk, AK | 151 | 38 | 24.0% |
| Cutter, AZ | 151 | 60 | 20.0% |
| North San Juan, CA | 151 | 44 | 12.0% |
| Winterhaven, CA | 151 | 45 | 10.0% |
| Montezuma, CO | 151 | 47 | 6.0% |
| Palmetto, LA | 151 | 41 | 18.0% |
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