| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 54°F | 42°F | 4.5" |
| February | 35°F | 57°F | 45°F | 3.7" |
| March | 44°F | 67°F | 55°F | 5.4" |
| April | 52°F | 77°F | 64°F | 5.9" |
| May | 61°F | 83°F | 72°F | 5.8" |
| June | 71°F | 92°F | 81°F | 3.6" |
| July | 73°F | 93°F | 83°F | 4.6" |
| August | 73°F | 93°F | 83°F | 3.9" |
| September | 66°F | 88°F | 76°F | 3.4" |
| October | 53°F | 78°F | 64°F | 3.7" |
| November | 42°F | 66°F | 53°F | 4.2" |
| December | 35°F | 56°F | 45°F | 5.6" |
| Index | Holly Springs | Mississippi | National |
| Air quality index | 45 | 40 | 42 |
| Pollution index | 752,278 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.100% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hickory Flat, MS | 668 | 39 | 22.0% |
| Potts Camp, MS | 438 | 39 | 22.0% |
| Snow Lake Shores, MS | 348 | 45 | 10.0% |
| Byhalia, MS | 1,643 | 45 | 10.0% |
| Holly Springs, MS | 7,727 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Murphysboro, IL | 7,727 | 43 | 14.0% |
| Pittston, PA | 7,729 | 38 | 24.0% |
| South Beloit, IL | 7,730 | 38 | 24.0% |
| Baldwinsville, NY | 7,732 | 37 | 26.0% |
| Providence, UT | 7,732 | 44 | 12.0% |
| Holly Springs, MS | 7,727 | 45 | 10.0% |
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