| 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 | Donaldsonville | Louisiana | National |
| Air quality index | 45 | 106 | 42 |
| Pollution index | 2,337,990 | 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 | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Convent, LA | 415 | 41 | 18.0% |
| Moonshine, LA | 127 | 41 | 18.0% |
| Napoleonville, LA | 620 | 41 | 18.0% |
| St. James, LA | 596 | 41 | 18.0% |
| Grand Point, LA | 2,798 | 41 | 18.0% |
| Donaldsonville, LA | 8,424 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Seneca, SC | 8,424 | 41 | 18.0% |
| Perry Heights, OH | 8,423 | 46 | 8.0% |
| North Haledon, NJ | 8,425 | 51 | 2.0% |
| Dalhart, TX | 8,422 | 44 | 12.0% |
| Virginia, MN | 8,421 | 35 | 30.0% |
| Donaldsonville, LA | 8,424 | 45 | 10.0% |
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