| 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 | Gramercy | 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. |
| Laplace, LA | 29,232 | 30 | 40.0% |
| Reserve, LA | 8,506 | 30 | 40.0% |
| Garyville, LA | 1,966 | 30 | 40.0% |
| Grand Point, LA | 2,798 | 41 | 18.0% |
| Paulina, LA | 1,761 | 41 | 18.0% |
| Gramercy, LA | 3,249 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Louisiana, MO | 3,248 | 41 | 18.0% |
| Mount Shasta, CA | 3,250 | 42 | 16.0% |
| Skippers Corner, NC | 3,250 | 34 | 32.0% |
| Cornville, AZ | 3,247 | 43 | 14.0% |
| Ferriday, LA | 3,247 | 30 | 40.0% |
| Gramercy, LA | 3,249 | 41 | 18.0% |
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