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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 61°F | 46°F | 5.5" |
| February | 36°F | 64°F | 49°F | 6.1" |
| March | 43°F | 73°F | 57°F | 6.3" |
| April | 50°F | 80°F | 65°F | 5.3" |
| May | 58°F | 85°F | 71°F | 4.3" |
| June | 67°F | 92°F | 79°F | 4.0" |
| July | 70°F | 93°F | 80°F | 5.3" |
| August | 70°F | 93°F | 80°F | 4.6" |
| September | 63°F | 89°F | 75°F | 3.0" |
| October | 50°F | 80°F | 64°F | 3.0" |
| November | 40°F | 71°F | 54°F | 3.6" |
| December | 37°F | 63°F | 49°F | 6.3" |
| Index | Heidelberg | Mississippi | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 528,695 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 229 |
| Days with moderate air quality | 16 |
| 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 | 0.010% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Laurel, MS | 18,403 | 35 | 30.0% |
| Sandersville, MS | 663 | 35 | 30.0% |
| Sharon, MS | 1,810 | 35 | 30.0% |
| Pachuta, MS | 158 | 36 | 28.0% |
| Heidelberg, MS | 912 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Altus, AR | 912 | 36 | 28.0% |
| Spiceland, IN | 912 | 28 | 44.0% |
| Sarepta, LA | 912 | 39 | 22.0% |
| Highfield-Cascade, MD | 912 | 40 | 20.0% |
| Stonewall, MS | 912 | 36 | 28.0% |
| Heidelberg, MS | 912 | 36 | 28.0% |
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