| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 56°F | 47°F | 3.5" |
| February | 43°F | 59°F | 50°F | 2.6" |
| March | 49°F | 64°F | 56°F | 2.4" |
| April | 58°F | 72°F | 65°F | 2.4" |
| May | 66°F | 78°F | 72°F | 1.6" |
| June | 73°F | 85°F | 79°F | 11.2" |
| July | 75°F | 86°F | 81°F | 4.5" |
| August | 75°F | 85°F | 80°F | 5.1" |
| September | 70°F | 81°F | 76°F | 10.7" |
| October | 60°F | 74°F | 67°F | 3.5" |
| November | 49°F | 65°F | 56°F | 1.2" |
| December | 45°F | 60°F | 52°F | 3.7" |
| Index | Jamestown | South Carolina | National |
| Air quality index | 14 | 37 | 42 |
| Pollution index | 783,589 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 92 |
| Days with good air quality | 91 |
| Days with moderate air quality | 1 |
| 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 | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| St. Stephen, SC | 1,511 | 14 | 72.0% |
| Andrews, SC | 3,041 | 14 | 72.0% |
| McClellanville, SC | 613 | 14 | 72.0% |
| Bonneau, SC | 1,801 | 38 | 24.0% |
| Jamestown, SC | 114 | 14 | 72.0% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeville, AL | 114 | 43 | 14.0% |
| Fulton, AR | 114 | 39 | 22.0% |
| Sweet Water Village, AZ | 114 | 74 | 48.0% |
| Keomah Village, IA | 114 | 35 | 30.0% |
| Donnellson, IL | 114 | 54 | 8.0% |
| Jamestown, SC | 114 | 14 | 72.0% |
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