| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 42°F | 3.3" |
| February | 33°F | 57°F | 44°F | 2.4" |
| March | 40°F | 66°F | 53°F | 3.5" |
| April | 49°F | 75°F | 62°F | 3.1" |
| May | 57°F | 81°F | 69°F | 3.6" |
| June | 66°F | 89°F | 77°F | 3.9" |
| July | 69°F | 91°F | 79°F | 4.0" |
| August | 68°F | 90°F | 78°F | 4.0" |
| September | 62°F | 84°F | 72°F | 3.3" |
| October | 49°F | 74°F | 61°F | 2.6" |
| November | 38°F | 64°F | 50°F | 3.3" |
| December | 35°F | 58°F | 46°F | 4.3" |
| Index | Newport | 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. |
| McConnells, SC | 293 | 36 | 28.0% |
| Lowrys, SC | 247 | 36 | 28.0% |
| Sharon, SC | 590 | 36 | 28.0% |
| York, SC | 8,287 | 36 | 28.0% |
| Fort Mill, SC | 19,920 | 49 | 2.0% |
| Newport, SC | 4,432 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Lenwood, CA | 4,431 | 89 | 78.0% |
| Springville, AL | 4,430 | 53 | 6.0% |
| Dilworth, MN | 4,430 | 33 | 34.0% |
| McSwain, CA | 4,429 | 48 | 4.0% |
| Pendleton, IN | 4,429 | 42 | 16.0% |
| Newport, SC | 4,432 | 49 | 2.0% |
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