| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 64°F | 54°F | 4.5" |
| February | 48°F | 67°F | 56°F | 3.0" |
| March | 55°F | 73°F | 63°F | 12.7" |
| April | 61°F | 79°F | 69°F | 7.3" |
| May | 67°F | 84°F | 75°F | 4.3" |
| June | 73°F | 89°F | 80°F | 5.2" |
| July | 75°F | 90°F | 81°F | 4.4" |
| August | 75°F | 90°F | 81°F | 4.9" |
| September | 71°F | 87°F | 78°F | 6.4" |
| October | 60°F | 80°F | 69°F | 3.9" |
| November | 51°F | 72°F | 60°F | 3.1" |
| December | 49°F | 67°F | 56°F | 3.7" |
| Index | Patterson | Louisiana | National |
| Air quality index | 41 | 106 | 42 |
| Pollution index | 1,868,490 | 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 | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Bayou Vista, LA | 4,346 | 41 | 18.0% |
| Baldwin, LA | 1,876 | 41 | 18.0% |
| Berwick, LA | 4,478 | 41 | 18.0% |
| Charenton, LA | 1,560 | 41 | 18.0% |
| Amelia, LA | 2,236 | 41 | 18.0% |
| Patterson, LA | 5,844 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| South Highpoint, FL | 5,844 | 43 | 14.0% |
| St. Martinville, LA | 5,844 | 41 | 18.0% |
| Branford Center, CT | 5,845 | 41 | 18.0% |
| White Rock, NM | 5,845 | 8 | 84.0% |
| Roseland, NJ | 5,841 | 51 | 2.0% |
| Patterson, LA | 5,844 | 41 | 18.0% |
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