| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 65°F | 52°F | 7.3" |
| February | 45°F | 67°F | 54°F | 7.3" |
| March | 52°F | 74°F | 62°F | 7.7" |
| April | 58°F | 80°F | 68°F | 9.7" |
| May | 63°F | 84°F | 73°F | 10.8" |
| June | 71°F | 90°F | 80°F | 6.2" |
| July | 72°F | 90°F | 80°F | 5.8" |
| August | 72°F | 90°F | 80°F | 9.5" |
| September | 69°F | 89°F | 77°F | 8.0" |
| October | 58°F | 82°F | 69°F | 24.8" |
| November | 47°F | 71°F | 57°F | 9.5" |
| December | 46°F | 66°F | 54°F | 10.8" |
| Index | Ventress | Louisiana | National |
| Air quality index | 45 | 106 | 42 |
| Pollution index | 1,313,820 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 132 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fordoche, LA | 953 | 45 | 10.0% |
| New Roads, LA | 4,500 | 45 | 10.0% |
| Livonia, LA | 1,304 | 45 | 10.0% |
| St. Francisville, LA | 1,891 | 45 | 10.0% |
| Maringouin, LA | 536 | 45 | 10.0% |
| Ventress, LA | 839 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Tulelake, CA | 839 | 29 | 42.0% |
| Dayton, IA | 839 | 37 | 26.0% |
| Horseshoe Bend, ID | 839 | 36 | 28.0% |
| Brownstown, IL | 839 | 40 | 20.0% |
| Middletown, MI | 839 | 38 | 24.0% |
| Ventress, LA | 839 | 45 | 10.0% |
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