| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 62°F | 50°F | 4.4" |
| February | 40°F | 64°F | 51°F | 5.6" |
| March | 47°F | 73°F | 59°F | 4.4" |
| April | 55°F | 79°F | 66°F | 6.3" |
| May | 63°F | 86°F | 74°F | 4.2" |
| June | 70°F | 93°F | 80°F | 2.7" |
| July | 72°F | 93°F | 81°F | 6.5" |
| August | 73°F | 93°F | 81°F | 3.6" |
| September | 68°F | 89°F | 77°F | 5.2" |
| October | 55°F | 79°F | 66°F | 5.2" |
| November | 44°F | 71°F | 56°F | 3.1" |
| December | 42°F | 64°F | 51°F | 8.7" |
| Index | Petal | Mississippi | National |
| Air quality index | 35 | 40 | 42 |
| Pollution index | 2,346,240 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 298 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Glendale, MS | 1,483 | 35 | 30.0% |
| New Augusta, MS | 461 | 35 | 30.0% |
| Hattiesburg, MS | 46,010 | 35 | 30.0% |
| Purvis, MS | 2,198 | 35 | 30.0% |
| Rawls Springs, MS | 1,708 | 35 | 30.0% |
| Petal, MS | 10,624 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Gardere, LA | 10,629 | 45 | 10.0% |
| Roscoe, IL | 10,632 | 42 | 16.0% |
| East Liverpool, OH | 10,632 | 6 | 88.0% |
| Lansdowne, PA | 10,637 | 51 | 2.0% |
| Broomall, PA | 10,608 | 51 | 2.0% |
| Petal, MS | 10,624 | 35 | 30.0% |
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