| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 52°F | 41°F | 8.3" |
| February | 33°F | 56°F | 44°F | 5.5" |
| March | 41°F | 65°F | 52°F | 4.6" |
| April | 49°F | 74°F | 61°F | 11.8" |
| May | 57°F | 80°F | 68°F | 10.6" |
| June | 66°F | 87°F | 76°F | 5.9" |
| July | 68°F | 89°F | 77°F | 6.8" |
| August | 67°F | 87°F | 76°F | 6.1" |
| September | 61°F | 81°F | 71°F | 11.6" |
| October | 49°F | 72°F | 60°F | 8.6" |
| November | 39°F | 63°F | 50°F | 11.0" |
| December | 36°F | 56°F | 45°F | 12.8" |
| Index | Grover | North Carolina | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 1,726,850 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 246 |
| Days with good air quality | 231 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dellview, NC | 25 | 36 | 28.0% |
| Smyrna, SC | 26 | 36 | 28.0% |
| Kingstown, NC | 581 | 36 | 28.0% |
| Shelby, NC | 20,046 | 36 | 28.0% |
| Kings Mountain, NC | 10,885 | 36 | 28.0% |
| Grover, NC | 588 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Plainview, AR | 588 | 38 | 24.0% |
| Avondale, CO | 588 | 20 | 60.0% |
| Irvington, IL | 588 | 43 | 14.0% |
| Payne Gap, KY | 588 | 45 | 10.0% |
| Catawba, NC | 588 | 43 | 14.0% |
| Grover, NC | 588 | 36 | 28.0% |
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