| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 59°F | 47°F | 5.3" |
| February | 40°F | 62°F | 50°F | 5.1" |
| March | 48°F | 71°F | 59°F | 5.0" |
| April | 55°F | 79°F | 66°F | 6.2" |
| May | 61°F | 84°F | 72°F | 4.9" |
| June | 69°F | 91°F | 80°F | 3.3" |
| July | 71°F | 93°F | 81°F | 4.5" |
| August | 71°F | 93°F | 81°F | 4.4" |
| September | 65°F | 89°F | 76°F | 2.8" |
| October | 52°F | 80°F | 65°F | 4.1" |
| November | 43°F | 69°F | 55°F | 3.9" |
| December | 40°F | 61°F | 49°F | 5.8" |
| Index | Newellton | Louisiana | National |
| Air quality index | 34 | 106 | 42 |
| Pollution index | 387,875 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| St. Joseph, LA | 821 | 34 | 32.0% |
| Alcorn State University, MS | 1,014 | 44 | 12.0% |
| Port Gibson, MS | 1,667 | 44 | 12.0% |
| Newellton, LA | 1,070 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Manassa, CO | 1,070 | 15 | 70.0% |
| Masaryktown, FL | 1,070 | 30 | 40.0% |
| Winfield, IA | 1,070 | 32 | 36.0% |
| Ironville, KY | 1,070 | 42 | 16.0% |
| Harmony, MN | 1,070 | 15 | 70.0% |
| Newellton, LA | 1,070 | 34 | 32.0% |
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