| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 61°F | 50°F | 8.4" |
| February | 43°F | 63°F | 51°F | 6.7" |
| March | 49°F | 72°F | 59°F | 6.7" |
| April | 53°F | 76°F | 63°F | 6.5" |
| May | 61°F | 84°F | 71°F | 12.5" |
| June | 69°F | 89°F | 78°F | 5.2" |
| July | 72°F | 90°F | 79°F | 6.5" |
| August | 72°F | 94°F | 82°F | 13.0" |
| September | 70°F | 88°F | 77°F | 8.9" |
| October | 55°F | 78°F | 65°F | 1.2" |
| November | 48°F | 72°F | 57°F | 7.0" |
| December | 42°F | 64°F | 51°F | 3.3" |
| Index | Gilbert | Louisiana | National |
| Air quality index | 34 | 106 | 42 |
| Pollution index | 3,849,440 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 335 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.440% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.320% |
| City | Population | Air Quality Index | National Avg. |
| Winnsboro, LA | 4,728 | 34 | 32.0% |
| Wisner, LA | 1,014 | 34 | 32.0% |
| Baskin, LA | 216 | 34 | 32.0% |
| Sicily Island, LA | 663 | 34 | 32.0% |
| Gilbert, LA | 367 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Muir Beach, CA | 367 | 40 | 20.0% |
| Fisher Island, FL | 367 | 41 | 18.0% |
| Atalissa, IA | 367 | 32 | 36.0% |
| Millbrook, IL | 367 | 0 | 100.0% |
| Sadorus, IL | 367 | 42 | 16.0% |
| Gilbert, LA | 367 | 34 | 32.0% |