| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 42°F | 3.2" |
| February | 33°F | 57°F | 45°F | 2.5" |
| March | 41°F | 66°F | 53°F | 3.7" |
| April | 50°F | 75°F | 62°F | 3.9" |
| May | 57°F | 81°F | 69°F | 4.3" |
| June | 66°F | 89°F | 76°F | 3.6" |
| July | 69°F | 90°F | 78°F | 3.6" |
| August | 69°F | 90°F | 78°F | 4.2" |
| September | 63°F | 84°F | 72°F | 4.1" |
| October | 50°F | 74°F | 61°F | 2.7" |
| November | 39°F | 65°F | 51°F | 3.4" |
| December | 36°F | 58°F | 46°F | 4.3" |
| Index | Clover | South Carolina | National |
| Air quality index | 49 | 37 | 42 |
| Pollution index | 13,834,800 | 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 | 0.020% |
| Benzene | 0.170% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.030% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| Gastonia, NC | 76,635 | 36 | 28.0% |
| Spencer Mountain, NC | 0 | 36 | 28.0% |
| York, SC | 8,287 | 36 | 28.0% |
| Kings Mountain, NC | 10,885 | 36 | 28.0% |
| Hickory Grove, SC | 597 | 36 | 28.0% |
| Clover, SC | 6,370 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Iowa Park, TX | 6,370 | 26 | 48.0% |
| St. John, MO | 6,369 | 54 | 8.0% |
| Douglas, WY | 6,369 | 42 | 16.0% |
| Air Force Academy, CO | 6,368 | 45 | 10.0% |
| Fowler, CA | 6,366 | 60 | 20.0% |
| Clover, SC | 6,370 | 49 | 2.0% |
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