| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 63°F | 52°F | 3.1" |
| February | 44°F | 64°F | 53°F | 4.5" |
| March | 51°F | 70°F | 60°F | 4.7" |
| April | 58°F | 77°F | 68°F | 6.2" |
| May | 67°F | 84°F | 75°F | 5.3" |
| June | 73°F | 90°F | 81°F | 4.4" |
| July | 75°F | 91°F | 82°F | 7.3" |
| August | 75°F | 91°F | 82°F | 6.2" |
| September | 72°F | 88°F | 79°F | 4.7" |
| October | 60°F | 80°F | 69°F | 4.6" |
| November | 49°F | 71°F | 59°F | 4.2" |
| December | 46°F | 65°F | 55°F | 7.6" |
| Index | Lyman | Mississippi | National |
| Air quality index | 42 | 40 | 42 |
| Pollution index | 414,728 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 264 |
| Days with moderate air quality | 100 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Diamondhead, MS | 8,076 | 42 | 16.0% |
| Long Beach, MS | 15,829 | 42 | 16.0% |
| Bay St. Louis, MS | 13,539 | 42 | 16.0% |
| D'Iberville, MS | 13,766 | 42 | 16.0% |
| Pass Christian, MS | 6,079 | 42 | 16.0% |
| Lyman, MS | 2,303 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Trenton, GA | 2,303 | 46 | 8.0% |
| Taylorsville, MS | 2,303 | 35 | 30.0% |
| Lyons, CO | 2,302 | 47 | 6.0% |
| Moore Haven, FL | 2,302 | 36 | 28.0% |
| Leonardo, NJ | 2,302 | 51 | 2.0% |
| Lyman, MS | 2,303 | 42 | 16.0% |
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