| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 42°F | 6.1" |
| February | 36°F | 57°F | 45°F | 6.6" |
| March | 42°F | 63°F | 51°F | 8.6" |
| April | 53°F | 75°F | 63°F | 7.8" |
| May | 61°F | 82°F | 71°F | 8.3" |
| June | 70°F | 88°F | 78°F | 6.4" |
| July | 68°F | 88°F | 77°F | 5.9" |
| August | 70°F | 91°F | 79°F | 6.0" |
| September | 65°F | 89°F | 76°F | 13.1" |
| October | 55°F | 78°F | 66°F | 6.4" |
| November | 43°F | 64°F | 52°F | 2.4" |
| December | 38°F | 54°F | 45°F | 3.5" |
| Index | Farrell | Mississippi | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 1,813,640 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 270 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lula, MS | 213 | 43 | 14.0% |
| Coahoma, MS | 273 | 43 | 14.0% |
| Elaine, AR | 717 | 43 | 14.0% |
| Lyon, MS | 439 | 43 | 14.0% |
| Friars Point, MS | 1,269 | 43 | 14.0% |
| Farrell, MS | 292 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Idledale, CO | 292 | 58 | 16.0% |
| Baldwin, IL | 292 | 54 | 8.0% |
| Campbell Hill, IL | 292 | 43 | 14.0% |
| Joy, IL | 292 | 32 | 36.0% |
| Vallonia, IN | 292 | 35 | 30.0% |
| Farrell, MS | 292 | 43 | 14.0% |
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