| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 61°F | 46°F | 5.5" |
| February | 36°F | 64°F | 49°F | 6.1" |
| March | 43°F | 73°F | 57°F | 6.3" |
| April | 50°F | 80°F | 65°F | 5.3" |
| May | 58°F | 85°F | 71°F | 4.3" |
| June | 67°F | 92°F | 79°F | 4.0" |
| July | 70°F | 93°F | 80°F | 5.3" |
| August | 70°F | 93°F | 80°F | 4.6" |
| September | 63°F | 89°F | 75°F | 3.0" |
| October | 50°F | 80°F | 64°F | 3.0" |
| November | 40°F | 71°F | 54°F | 3.6" |
| December | 37°F | 63°F | 49°F | 6.3" |
| Index | Marion | Mississippi | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 2,737,890 | 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 | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Meridian Station, MS | 450 | 36 | 28.0% |
| Toomsuba, MS | 623 | 36 | 28.0% |
| Lauderdale, MS | 270 | 36 | 28.0% |
| Collinsville, MS | 1,467 | 36 | 28.0% |
| Meridian, MS | 37,252 | 36 | 28.0% |
| Marion, MS | 1,992 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Lorenz Park, NY | 1,992 | 37 | 26.0% |
| Yorklyn, PA | 1,992 | 41 | 18.0% |
| Bell Canyon, CA | 1,991 | 72 | 44.0% |
| Munising, MI | 1,991 | 8 | 84.0% |
| Edisto, SC | 1,993 | 43 | 14.0% |
| Marion, MS | 1,992 | 36 | 28.0% |
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