| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 49°F | 40°F | 10.9" |
| February | 34°F | 52°F | 41°F | 7.4" |
| March | 43°F | 68°F | 53°F | 5.4" |
| April | 49°F | 71°F | 59°F | 8.1" |
| May | 59°F | 83°F | 70°F | 9.3" |
| June | 69°F | 90°F | 79°F | 3.3" |
| July | 70°F | 89°F | 79°F | 9.9" |
| August | 72°F | 95°F | 82°F | 1.9" |
| September | 65°F | 87°F | 74°F | 4.3" |
| October | 52°F | 76°F | 62°F | 15.9" |
| November | 42°F | 64°F | 51°F | 5.4" |
| December | 32°F | 50°F | 39°F | 7.9" |
| Index | Walnut Ridge | Arkansas | National |
| Air quality index | 45 | 38 | 50 |
| Pollution index | 507,185 | 1,270,108 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| O'Kean, AR | 198 | 26 | 48% |
| Imboden, AR | 622 | 26 | 48% |
| Pocahontas, AR | 6,470 | 26 | 48% |
| Delaplaine, AR | 63 | 26 | 48% |
| Hoxie, AR | 2,704 | 45 | 10% |
| Walnut Ridge, AR | 4,723 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Vandercook Lake, MI | 4,723 | 39 | 22% |
| Colville, WA | 4,724 | 43 | 14% |
| Meadows Place, TX | 4,721 | 52 | 4% |
| Seat Pleasant, MD | 4,721 | 47 | 6% |
| Houlton, ME | 4,725 | 31 | 38% |
| Walnut Ridge, AR | 4,723 | 45 | 10% |
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