| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 61°F | 47°F | 5.3" |
| February | 38°F | 64°F | 50°F | 5.9" |
| March | 45°F | 73°F | 58°F | 6.4" |
| April | 53°F | 80°F | 66°F | 5.8" |
| May | 60°F | 85°F | 72°F | 4.5" |
| June | 69°F | 92°F | 80°F | 4.0" |
| July | 71°F | 94°F | 81°F | 5.2" |
| August | 71°F | 94°F | 81°F | 4.9" |
| September | 65°F | 90°F | 76°F | 3.8" |
| October | 52°F | 81°F | 66°F | 3.3" |
| November | 43°F | 71°F | 55°F | 4.2" |
| December | 39°F | 63°F | 50°F | 6.0" |
| Index | Walnut Grove | Mississippi | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 462,865 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 229 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Pearl River, MS | 4,005 | 36 | 28.0% |
| Sebastopol, MS | 325 | 36 | 28.0% |
| Standing Pine, MS | 608 | 36 | 28.0% |
| Conehatta, MS | 1,239 | 36 | 28.0% |
| Carthage, MS | 4,773 | 44 | 12.0% |
| Walnut Grove, MS | 1,027 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Glidden, IA | 1,027 | 37 | 26.0% |
| Monroe City, IN | 1,027 | 36 | 28.0% |
| Barataria, LA | 1,027 | 45 | 10.0% |
| Belgrade, MN | 1,027 | 32 | 36.0% |
| Boulder, MT | 1,027 | 40 | 20.0% |
| Walnut Grove, MS | 1,027 | 36 | 28.0% |
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