| 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 | Hilton Head Island | South Carolina | National |
| Air quality index | 39 | 37 | 42 |
| Pollution index | 1,428,370 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 295 |
| Days with moderate air quality | 70 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Talahi Island, GA | 1,224 | 39 | 22.0% |
| Port Royal, SC | 13,265 | 39 | 22.0% |
| Wilmington Island, GA | 15,607 | 39 | 22.0% |
| Shell Point, SC | 2,991 | 39 | 22.0% |
| Tybee Island, GA | 3,094 | 39 | 22.0% |
| Hilton Head Island, SC | 40,000 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Hagerstown, MD | 40,027 | 40 | 20.0% |
| Montclair, CA | 40,041 | 89 | 78.0% |
| Spanish Fork, UT | 40,069 | 46 | 8.0% |
| Streamwood, IL | 39,917 | 55 | 10.0% |
| Marion, IA | 39,910 | 39 | 22.0% |
| Hilton Head Island, SC | 40,000 | 39 | 22.0% |
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