| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 53°F | 44°F | 9.4" |
| February | 38°F | 56°F | 45°F | 3.6" |
| March | 48°F | 70°F | 56°F | 5.2" |
| April | 52°F | 74°F | 61°F | 6.9" |
| May | 63°F | 84°F | 72°F | 4.2" |
| June | 71°F | 91°F | 80°F | 3.0" |
| July | 72°F | 90°F | 79°F | 7.8" |
| August | 74°F | 96°F | 84°F | 6.3" |
| September | 67°F | 88°F | 76°F | 11.9" |
| October | 55°F | 76°F | 64°F | 17.9" |
| November | 46°F | 68°F | 55°F | 5.5" |
| December | 36°F | 56°F | 44°F | 9.2" |
| Index | DeWitt | Arkansas | National |
| Air quality index | 43 | 38 | 42 |
| Pollution index | 855,910 | 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 | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Gillett, AR | 585 | 43 | 14.0% |
| St. Charles, AR | 338 | 43 | 14.0% |
| Almyra, AR | 206 | 45 | 10.0% |
| Stuttgart, AR | 8,617 | 45 | 10.0% |
| DeWitt, AR | 3,046 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Topsfield, MA | 3,046 | 43 | 14.0% |
| South Eliot, ME | 3,047 | 37 | 26.0% |
| Longtown, OK | 3,044 | 43 | 14.0% |
| Algoma, WI | 3,044 | 36 | 28.0% |
| Saint-Liboire, QC | 3,048 | n/a | |
| DeWitt, AR | 3,046 | 43 | 14.0% |
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