| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 57°F | 45°F | 8.2" |
| February | 39°F | 60°F | 48°F | 6.0" |
| March | 46°F | 69°F | 57°F | 8.6" |
| April | 55°F | 78°F | 65°F | 9.5" |
| May | 61°F | 83°F | 71°F | 7.5" |
| June | 70°F | 91°F | 80°F | 7.6" |
| July | 73°F | 93°F | 82°F | 6.7" |
| August | 72°F | 93°F | 81°F | 7.3" |
| September | 65°F | 89°F | 76°F | 3.5" |
| October | 54°F | 79°F | 65°F | 7.4" |
| November | 44°F | 66°F | 54°F | 6.8" |
| December | 39°F | 58°F | 47°F | 7.8" |
| Index | McGehee | Arkansas | National |
| Air quality index | 43 | 38 | 42 |
| Pollution index | 2,498,240 | 1,487,822 | 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 | 0.060% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Dermott, AR | 2,807 | 43 | 14.0% |
| Reed, AR | 118 | 43 | 14.0% |
| Tillar, AR | 223 | 43 | 14.0% |
| Arkansas City, AR | 487 | 43 | 14.0% |
| Winchester, AR | 138 | 43 | 14.0% |
| McGehee, AR | 3,748 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Fordyce, AR | 3,748 | 32 | 36.0% |
| Bishop, CA | 3,747 | 47 | 6.0% |
| Oregon, IL | 3,747 | 42 | 16.0% |
| St. Charles, MN | 3,749 | 15 | 70.0% |
| University, MS | 3,749 | 33 | 34.0% |
| McGehee, AR | 3,748 | 43 | 14.0% |
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