| 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 | Lockhart | South Carolina | National |
| Air quality index | 36 | 37 | 42 |
| Pollution index | 1,726,850 | 3,620,438 | 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. |
| McConnells, SC | 293 | 36 | 28.0% |
| Carlisle, SC | 571 | 36 | 28.0% |
| Lowrys, SC | 247 | 36 | 28.0% |
| Sharon, SC | 590 | 36 | 28.0% |
| Chester, SC | 5,392 | 36 | 28.0% |
| Lockhart, SC | 427 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Spillville, IA | 427 | 39 | 22.0% |
| Hopewell, IL | 427 | 41 | 18.0% |
| Oak Grove, IL | 427 | 46 | 8.0% |
| Scotch Meadows, NC | 427 | 30 | 40.0% |
| Turkey, NC | 427 | 40 | 20.0% |
| Lockhart, SC | 427 | 36 | 28.0% |
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