| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 44°F | 3.9" |
| February | 38°F | 59°F | 47°F | 3.1" |
| March | 46°F | 68°F | 56°F | 6.0" |
| April | 55°F | 77°F | 65°F | 5.1" |
| May | 61°F | 83°F | 72°F | 3.1" |
| June | 70°F | 91°F | 80°F | 2.9" |
| July | 72°F | 93°F | 82°F | 3.1" |
| August | 72°F | 93°F | 81°F | 3.4" |
| September | 65°F | 90°F | 76°F | 2.7" |
| October | 53°F | 79°F | 65°F | 3.6" |
| November | 44°F | 67°F | 54°F | 4.1" |
| December | 39°F | 57°F | 47°F | 4.2" |
| Index | Leland | Mississippi | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 2,498,240 | 1,514,109 | 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. |
| Metcalfe, MS | 953 | 43 | 14.0% |
| Shaw, MS | 1,955 | 43 | 14.0% |
| Arcola, MS | 296 | 43 | 14.0% |
| Indianola, MS | 9,258 | 43 | 14.0% |
| Greenville, MS | 29,854 | 43 | 14.0% |
| Leland, MS | 3,866 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Eastwood, LA | 3,866 | 39 | 22.0% |
| Valdez, AK | 3,865 | 31 | 38.0% |
| Ridgecrest, FL | 3,865 | 43 | 14.0% |
| Eastland, TX | 3,865 | 33 | 34.0% |
| Claresholm, AB | 3,865 | n/a | |
| Leland, MS | 3,866 | 43 | 14.0% |
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