| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 46°F | 5.2" |
| February | 37°F | 61°F | 48°F | 6.7" |
| March | 44°F | 70°F | 56°F | 5.9" |
| April | 53°F | 78°F | 65°F | 7.0" |
| May | 60°F | 84°F | 72°F | 6.7" |
| June | 69°F | 91°F | 79°F | 9.9" |
| July | 72°F | 93°F | 81°F | 10.2" |
| August | 71°F | 91°F | 80°F | 7.7" |
| September | 65°F | 86°F | 75°F | 9.1" |
| October | 54°F | 77°F | 64°F | 12.0" |
| November | 43°F | 67°F | 54°F | 6.9" |
| December | 39°F | 62°F | 50°F | 7.2" |
| Index | Bishopville | South Carolina | National |
| Air quality index | 40 | 37 | 42 |
| Pollution index | 1,817,360 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 288 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Lydia, SC | 419 | 40 | 20.0% |
| Oswego, SC | 197 | 40 | 20.0% |
| North Hartsville, SC | 1,972 | 40 | 20.0% |
| Hartsville, SC | 7,559 | 40 | 20.0% |
| Bethune, SC | 387 | 40 | 20.0% |
| Bishopville, SC | 3,043 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| East Gaffney, SC | 3,043 | 36 | 28.0% |
| McCormick, SC | 3,043 | 47 | 6.0% |
| West Brattleboro, VT | 3,042 | 34 | 32.0% |
| Longtown, OK | 3,044 | 43 | 14.0% |
| Algoma, WI | 3,044 | 36 | 28.0% |
| Bishopville, SC | 3,043 | 40 | 20.0% |
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