| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 43°F | 3.9" |
| February | 35°F | 58°F | 46°F | 3.0" |
| March | 43°F | 67°F | 54°F | 3.9" |
| April | 51°F | 76°F | 63°F | 4.1" |
| May | 59°F | 81°F | 70°F | 3.8" |
| June | 68°F | 89°F | 78°F | 4.4" |
| July | 71°F | 91°F | 80°F | 4.2" |
| August | 71°F | 89°F | 79°F | 5.5" |
| September | 65°F | 84°F | 73°F | 2.8" |
| October | 52°F | 75°F | 63°F | 3.4" |
| November | 41°F | 65°F | 53°F | 3.2" |
| December | 38°F | 57°F | 47°F | 5.0" |
| Index | West Pelzer | South Carolina | National |
| Air quality index | 31 | 37 | 42 |
| Pollution index | 1,548,730 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 250 |
| Days with good air quality | 248 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Princeton, SC | 60 | 31 | 38.0% |
| Pelzer, SC | 1,653 | 31 | 38.0% |
| Homeland Park, SC | 6,570 | 31 | 38.0% |
| Anderson, SC | 27,387 | 31 | 38.0% |
| Honea Path, SC | 3,753 | 31 | 38.0% |
| West Pelzer, SC | 1,049 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Skyline, AL | 1,049 | 44 | 12.0% |
| Herald, CA | 1,049 | 45 | 10.0% |
| Saybrook Manor, CT | 1,049 | 37 | 26.0% |
| Canon, GA | 1,049 | 41 | 18.0% |
| Onset, MA | 1,049 | 36 | 28.0% |
| West Pelzer, SC | 1,049 | 31 | 38.0% |
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