| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 64°F | 53°F | 5.6" |
| February | 47°F | 67°F | 56°F | 4.5" |
| March | 54°F | 74°F | 63°F | 3.3" |
| April | 60°F | 81°F | 70°F | 4.9" |
| May | 67°F | 86°F | 76°F | 5.8" |
| June | 73°F | 91°F | 81°F | 5.8" |
| July | 75°F | 92°F | 82°F | 5.9" |
| August | 75°F | 93°F | 82°F | 7.6" |
| September | 71°F | 89°F | 79°F | 5.5" |
| October | 60°F | 82°F | 70°F | 3.6" |
| November | 51°F | 73°F | 61°F | 4.1" |
| December | 46°F | 66°F | 55°F | 5.9" |
| Index | Cecilia | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 3,383,350 | 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 | 0.003% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Broussard, LA | 12,248 | 41 | 18.0% |
| Lafayette, LA | 126,674 | 41 | 18.0% |
| Henderson, LA | 2,261 | 41 | 18.0% |
| St. Martinville, LA | 5,844 | 41 | 18.0% |
| Carencro, LA | 9,346 | 41 | 18.0% |
| Cecilia, LA | 1,323 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Point MacKenzie, AK | 1,323 | 31 | 38.0% |
| Cordry Sweetwater Lakes, IN | 1,323 | 41 | 18.0% |
| Cordova, NC | 1,323 | 41 | 18.0% |
| Pleasant Hills, OH | 1,323 | 54 | 8.0% |
| Thorndale, TX | 1,323 | 44 | 12.0% |
| Cecilia, LA | 1,323 | 41 | 18.0% |
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