| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 57°F | 46°F | 10.2" |
| February | 39°F | 59°F | 47°F | 9.7" |
| March | 46°F | 70°F | 57°F | 3.9" |
| April | 50°F | 75°F | 61°F | 25.3" |
| May | 59°F | 84°F | 71°F | 11.6" |
| June | 68°F | 91°F | 78°F | 18.9" |
| July | 71°F | 91°F | 79°F | 9.7" |
| August | 73°F | 96°F | 83°F | 4.1" |
| September | 67°F | 88°F | 77°F | 10.8" |
| October | 54°F | 78°F | 64°F | 18.6" |
| November | 44°F | 69°F | 54°F | 0.7" |
| December | 37°F | 60°F | 47°F | 6.0" |
| Index | Weir | Mississippi | National |
| Air quality index | 33 | 40 | 42 |
| Pollution index | 1,033,610 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 101 |
| Days with good air quality | 77 |
| Days with moderate air quality | 24 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.004% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Ackerman, MS | 1,700 | 33 | 34.0% |
| McCool, MS | 115 | 33 | 34.0% |
| Ethel, MS | 542 | 33 | 34.0% |
| Sturgis, MS | 197 | 33 | 34.0% |
| French Camp, MS | 250 | 33 | 34.0% |
| Weir, MS | 640 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Maplesville, AL | 640 | 52 | 4.0% |
| West Point, CA | 640 | 39 | 22.0% |
| Garwin, IA | 640 | 39 | 22.0% |
| Moulton, IA | 640 | 29 | 42.0% |
| Coffeen, IL | 640 | 40 | 20.0% |
| Weir, MS | 640 | 33 | 34.0% |
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