| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 62°F | 50°F | 2.8" |
| February | 41°F | 64°F | 52°F | 3.8" |
| March | 48°F | 71°F | 59°F | 4.2" |
| April | 56°F | 79°F | 67°F | 3.9" |
| May | 64°F | 85°F | 74°F | 3.5" |
| June | 71°F | 90°F | 80°F | 4.8" |
| July | 74°F | 93°F | 82°F | 4.8" |
| August | 74°F | 91°F | 82°F | 7.7" |
| September | 69°F | 87°F | 77°F | 4.7" |
| October | 59°F | 79°F | 68°F | 3.9" |
| November | 47°F | 70°F | 58°F | 2.1" |
| December | 44°F | 66°F | 54°F | 3.3" |
| Index | Yemassee | South Carolina | National |
| Air quality index | 29 | 37 | 42 |
| Pollution index | 533,195 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 7 |
| Days with good air quality | 7 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeland, SC | 3,903 | 29 | 42.0% |
| Walterboro, SC | 5,417 | 29 | 42.0% |
| Hampton, SC | 3,077 | 29 | 42.0% |
| Islandton, SC | 49 | 29 | 42.0% |
| Varnville, SC | 1,832 | 29 | 42.0% |
| Yemassee, SC | 870 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Hills, IA | 870 | 35 | 30.0% |
| Downey, ID | 870 | 27 | 46.0% |
| Dugger, IN | 870 | 45 | 10.0% |
| Au Gres, MI | 870 | 26 | 48.0% |
| Brookside, OH | 870 | 39 | 22.0% |
| Yemassee, SC | 870 | 29 | 42.0% |
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