| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 57°F | 44°F | 4.7" |
| February | 32°F | 56°F | 43°F | 4.9" |
| March | 40°F | 67°F | 53°F | 9.2" |
| April | 46°F | 73°F | 59°F | 5.1" |
| May | 54°F | 80°F | 67°F | 3.1" |
| June | 65°F | 87°F | 75°F | 7.7" |
| July | 69°F | 90°F | 78°F | 6.0" |
| August | 71°F | 93°F | 81°F | 3.6" |
| September | 63°F | 88°F | 75°F | 1.5" |
| October | 54°F | 77°F | 64°F | 3.9" |
| November | 39°F | 66°F | 52°F | 4.6" |
| December | 34°F | 58°F | 44°F | 7.2" |
| Index | Fort Mill | South Carolina | National |
| Air quality index | 49 | 37 | 42 |
| Pollution index | 5,729,570 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 200 |
| Days with moderate air quality | 147 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 4.280% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.130% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| JAARS, NC | 1,090 | 49 | 2.0% |
| Lake Wylie, SC | 14,091 | 49 | 2.0% |
| Rock Hill, SC | 74,410 | 49 | 2.0% |
| Mineral Springs, NC | 3,057 | 49 | 2.0% |
| Wesley Chapel, NC | 9,287 | 49 | 2.0% |
| Fort Mill, SC | 19,920 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Ennis, TX | 19,917 | 41 | 18.0% |
| Snellville, GA | 19,923 | 52 | 4.0% |
| Parma Heights, OH | 19,916 | 50 | = 100 |
| Havelock, NC | 19,927 | 37 | 26.0% |
| Lake Zurich, IL | 19,912 | 55 | 10.0% |
| Fort Mill, SC | 19,920 | 49 | 2.0% |
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