| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 62°F | 49°F | 5.7" |
| February | 42°F | 65°F | 52°F | 5.2" |
| March | 49°F | 72°F | 59°F | 6.1" |
| April | 55°F | 79°F | 66°F | 4.3" |
| May | 62°F | 84°F | 72°F | 4.7" |
| June | 70°F | 91°F | 79°F | 3.7" |
| July | 71°F | 91°F | 80°F | 6.4" |
| August | 72°F | 92°F | 80°F | 6.5" |
| September | 67°F | 88°F | 76°F | 4.5" |
| October | 56°F | 80°F | 67°F | 3.6" |
| November | 46°F | 70°F | 57°F | 3.1" |
| December | 43°F | 63°F | 52°F | 6.5" |
| Index | Wesson | Mississippi | National |
| Air quality index | 44 | 40 | 42 |
| Pollution index | 925,532 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 256 |
| Days with moderate air quality | 109 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beauregard, MS | 487 | 44 | 12.0% |
| Brookhaven, MS | 12,045 | 44 | 12.0% |
| Georgetown, MS | 248 | 44 | 12.0% |
| Hazlehurst, MS | 3,801 | 44 | 12.0% |
| Wesson, MS | 2,224 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Easton, CA | 2,224 | 60 | 20.0% |
| Ely, IA | 2,224 | 39 | 22.0% |
| Sumner, IA | 2,224 | 39 | 22.0% |
| Spencer, IN | 2,224 | 42 | 16.0% |
| Granby, MO | 2,224 | 37 | 26.0% |
| Wesson, MS | 2,224 | 44 | 12.0% |
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