| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 64°F | 50°F | 2.9" |
| February | 39°F | 66°F | 51°F | 3.7" |
| March | 45°F | 72°F | 58°F | 3.1" |
| April | 53°F | 80°F | 66°F | 3.4" |
| May | 62°F | 85°F | 73°F | 3.4" |
| June | 70°F | 91°F | 79°F | 6.6" |
| July | 73°F | 92°F | 82°F | 6.5" |
| August | 73°F | 91°F | 81°F | 8.0" |
| September | 68°F | 87°F | 76°F | 5.9" |
| October | 56°F | 80°F | 67°F | 5.6" |
| November | 45°F | 72°F | 57°F | 2.9" |
| December | 42°F | 67°F | 53°F | 3.7" |
| Index | Awendaw | South Carolina | National |
| Air quality index | 38 | 37 | 42 |
| Pollution index | 783,589 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 355 |
| Days with good air quality | 299 |
| Days with moderate air quality | 55 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| McClellanville, SC | 613 | 14 | 72.0% |
| Mount Pleasant, SC | 89,410 | 38 | 24.0% |
| Awendaw, SC | 1,744 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Osakis, MN | 1,744 | 32 | 36.0% |
| Tenino, WA | 1,744 | 20 | 60.0% |
| Tonto Basin, AZ | 1,743 | 60 | 20.0% |
| Graton, CA | 1,743 | 34 | 32.0% |
| Athens, NY | 1,743 | 37 | 26.0% |
| Awendaw, SC | 1,744 | 38 | 24.0% |
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