| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 59°F | 48°F | 3.3" |
| February | 41°F | 62°F | 50°F | 3.6" |
| March | 48°F | 71°F | 58°F | 3.4" |
| April | 56°F | 79°F | 67°F | 3.1" |
| May | 63°F | 85°F | 73°F | 2.7" |
| June | 71°F | 92°F | 80°F | 4.6" |
| July | 73°F | 93°F | 82°F | 4.4" |
| August | 73°F | 92°F | 81°F | 5.4" |
| September | 68°F | 87°F | 76°F | 3.3" |
| October | 57°F | 78°F | 67°F | 2.3" |
| November | 46°F | 68°F | 56°F | 2.6" |
| December | 43°F | 63°F | 52°F | 4.9" |
| Index | Aiken | South Carolina | National |
| Air quality index | 47 | 37 | 42 |
| Pollution index | 393,366 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 219 |
| Days with moderate air quality | 144 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Belvedere, SC | 5,557 | 47 | 6.0% |
| Graniteville, SC | 2,566 | 47 | 6.0% |
| Trenton, SC | 266 | 47 | 6.0% |
| Burnettown, SC | 2,731 | 47 | 6.0% |
| Langley, SC | 2,179 | 47 | 6.0% |
| Aiken, SC | 31,428 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairbanks, AK | 31,427 | 38 | 24.0% |
| Saint-Constant, QC | 31,461 | n/a | |
| El Paso de Robles (Paso Robles), CA | 31,480 | 46 | 8.0% |
| Shawnee, OK | 31,361 | 36 | 28.0% |
| Redmond, OR | 31,359 | 20 | 60.0% |
| Aiken, SC | 31,428 | 47 | 6.0% |
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