| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 55°F | 41°F | 6.5" |
| February | 30°F | 57°F | 42°F | 4.1" |
| March | 36°F | 64°F | 49°F | 5.2" |
| April | 49°F | 77°F | 63°F | 8.1" |
| May | 57°F | 83°F | 70°F | 7.7" |
| June | 66°F | 88°F | 76°F | 8.4" |
| July | 70°F | 90°F | 78°F | 10.9" |
| August | 67°F | 88°F | 76°F | 5.5" |
| September | 62°F | 85°F | 72°F | 4.9" |
| October | 50°F | 76°F | 62°F | 4.0" |
| November | 35°F | 63°F | 47°F | 7.1" |
| December | 35°F | 59°F | 46°F | 7.8" |
| Index | Chesterfield | South Carolina | National |
| Air quality index | 40 | 37 | 42 |
| Pollution index | 691,074 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| McFarlan, NC | 92 | 40 | 20.0% |
| Ruby, SC | 304 | 40 | 20.0% |
| Morven, NC | 477 | 40 | 20.0% |
| Cheraw, SC | 5,596 | 40 | 20.0% |
| Patrick, SC | 323 | 40 | 20.0% |
| Chesterfield, SC | 1,486 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Wauregan, CT | 1,486 | 33 | 34.0% |
| Maysville, OK | 1,486 | 48 | 4.0% |
| Hereford, PA | 1,486 | 42 | 16.0% |
| Conway Springs, KS | 1,485 | 40 | 20.0% |
| Steelville, MO | 1,485 | 39 | 22.0% |
| Chesterfield, SC | 1,486 | 40 | 20.0% |
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