| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 51°F | 40°F | 4.1" |
| February | 33°F | 53°F | 42°F | 3.4" |
| March | 41°F | 65°F | 52°F | 5.8" |
| April | 50°F | 74°F | 62°F | 5.8" |
| May | 58°F | 81°F | 69°F | 6.0" |
| June | 67°F | 89°F | 77°F | 4.8" |
| July | 69°F | 91°F | 79°F | 4.2" |
| August | 68°F | 91°F | 79°F | 3.0" |
| September | 61°F | 85°F | 72°F | 3.6" |
| October | 48°F | 74°F | 60°F | 3.5" |
| November | 39°F | 63°F | 50°F | 4.0" |
| December | 34°F | 53°F | 43°F | 5.5" |
| Index | Walnut | Mississippi | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 752,278 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 222 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.100% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hickory Valley, TN | 86 | 27 | 46.0% |
| Middleton, TN | 877 | 27 | 46.0% |
| Saulsbury, TN | 250 | 27 | 46.0% |
| Ashland, MS | 492 | 39 | 22.0% |
| Falkner, MS | 921 | 39 | 22.0% |
| Walnut, MS | 1,253 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Galena, IN | 1,253 | 49 | 2.0% |
| Edina, MO | 1,253 | 41 | 18.0% |
| Creighton, NE | 1,253 | 35 | 30.0% |
| Munday, TX | 1,253 | 26 | 48.0% |
| Orangeville, UT | 1,253 | 46 | 8.0% |
| Walnut, MS | 1,253 | 39 | 22.0% |
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