| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 57°F | 44°F | 4.7" |
| February | 32°F | 56°F | 43°F | 4.9" |
| March | 40°F | 67°F | 53°F | 9.2" |
| April | 46°F | 73°F | 59°F | 5.1" |
| May | 54°F | 80°F | 67°F | 3.1" |
| June | 65°F | 87°F | 75°F | 7.7" |
| July | 69°F | 90°F | 78°F | 6.0" |
| August | 71°F | 93°F | 81°F | 3.6" |
| September | 63°F | 88°F | 75°F | 1.5" |
| October | 54°F | 77°F | 64°F | 3.9" |
| November | 39°F | 66°F | 52°F | 4.6" |
| December | 34°F | 58°F | 44°F | 7.2" |
| Index | Chester | 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. |
| Lowrys, SC | 247 | 36 | 28.0% |
| McConnells, SC | 293 | 36 | 28.0% |
| Carlisle, SC | 571 | 36 | 28.0% |
| Eureka Mill, SC | 2,121 | 36 | 28.0% |
| Lockhart, SC | 427 | 36 | 28.0% |
| Chester, SC | 5,392 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Cowichan Valley A, BC | 5,392 | n/a | |
| Pinckneyville, IL | 5,391 | 43 | 14.0% |
| Fruitland, ID | 5,390 | 36 | 28.0% |
| Val-David, QC | 5,390 | n/a | |
| Sinton, TX | 5,389 | 42 | 16.0% |
| Chester, SC | 5,392 | 36 | 28.0% |
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