| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 57°F | 48°F | 5.8" |
| February | 41°F | 59°F | 49°F | 4.3" |
| March | 47°F | 65°F | 56°F | 6.0" |
| April | 56°F | 73°F | 64°F | 7.8" |
| May | 64°F | 79°F | 71°F | 5.1" |
| June | 72°F | 86°F | 79°F | 6.3" |
| July | 74°F | 89°F | 81°F | 11.0" |
| August | 74°F | 88°F | 81°F | 7.7" |
| September | 69°F | 84°F | 76°F | 7.7" |
| October | 58°F | 76°F | 66°F | 13.6" |
| November | 47°F | 67°F | 56°F | 9.1" |
| December | 43°F | 61°F | 51°F | 5.3" |
| Index | Aynor | South Carolina | National |
| Air quality index | 40 | 37 | 42 |
| Pollution index | 940,521 | 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. |
| Conway, SC | 24,747 | 14 | 72.0% |
| Red Hill, SC | 16,290 | 14 | 72.0% |
| Marion, SC | 6,598 | 40 | 20.0% |
| Mullins, SC | 4,276 | 40 | 20.0% |
| Johnsonville, SC | 1,175 | 40 | 20.0% |
| Aynor, SC | 785 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Greenville, CA | 785 | 46 | 8.0% |
| Paragon Estates, CO | 785 | 47 | 6.0% |
| Attapulgus, GA | 785 | 40 | 20.0% |
| Milan, GA | 785 | 26 | 48.0% |
| Ubly, MI | 785 | 26 | 48.0% |
| Aynor, SC | 785 | 40 | 20.0% |
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