| 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 | 50 |
| 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 | 1,015 | 43 | 14.0% |
| Shaw, MS | 1,750 | 43 | 14.0% |
| Arcola, MS | 357 | 43 | 14.0% |
| Indianola, MS | 10,047 | 43 | 14.0% |
| Greenville, MS | 32,612 | 43 | 14.0% |
| Leland, MS | 4,254 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Holiday City South, NJ | 4,254 | 41 | 18.0% |
| Bristow, OK | 4,254 | 45 | 10.0% |
| Highland CDP, IN | 4,256 | 55 | 10.0% |
| Slaughterville, OK | 4,256 | 48 | 4.0% |
| Honesdale, PA | 4,258 | 38 | 24.0% |
| Leland, MS | 4,254 | 43 | 14.0% |
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