| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 64°F | 51°F | 4.4" |
| February | 43°F | 66°F | 54°F | 4.5" |
| March | 50°F | 73°F | 61°F | 4.1" |
| April | 56°F | 78°F | 67°F | 5.7" |
| May | 62°F | 84°F | 73°F | 5.4" |
| June | 70°F | 90°F | 79°F | 6.2" |
| July | 72°F | 91°F | 80°F | 6.6" |
| August | 73°F | 91°F | 80°F | 8.9" |
| September | 68°F | 88°F | 77°F | 5.8" |
| October | 56°F | 81°F | 67°F | 3.7" |
| November | 46°F | 72°F | 58°F | 2.7" |
| December | 44°F | 66°F | 54°F | 5.9" |
| Index | Helena | Mississippi | National |
| Air quality index | 32 | 40 | 42 |
| Pollution index | 428,388 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 330 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bayou La Batre, AL | 2,332 | 32 | 36.0% |
| Hurley, MS | 1,279 | 32 | 36.0% |
| Moss Point, MS | 13,396 | 32 | 36.0% |
| Grand Bay, AL | 3,829 | 32 | 36.0% |
| Vancleave, MS | 4,934 | 32 | 36.0% |
| Helena, MS | 794 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| McCammon, ID | 794 | 27 | 46.0% |
| La Belle, MO | 794 | 41 | 18.0% |
| Lancaster, MO | 794 | 29 | 42.0% |
| New Florence, MO | 794 | 39 | 22.0% |
| Ellenboro, NC | 794 | 36 | 28.0% |
| Helena, MS | 794 | 32 | 36.0% |
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