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| Hilton Head Air Quality Beaufort County/Savannah |
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| . | Good Days | Moderate Days | Unhealthy for Sensitive Persons Days | Unhealthy Days | Very Unhealthy Days |
| 2017 | 289 | 76 | 0 | 0 | 0 |
| 2016 | na | na | na | na | na |
| 2015 | 299 | 65 | 0 | 1 | 0 |
| 2014 | 255 | 108 | 2 | 0 | 0 |
| 2013 | 249 | 106 | 10 | 0 | 0 |
| Hilton Head Water Quality Broad-St Helena Watershed |
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| . | % Good | % Threatened | % Impaired |
| 2014 | na | na | na |
| 2012 | 34 | 0 | 66 |
| 2010 | 30 | 0 | 70 |
| 2008 | 21 | 0 | 79 |
| 2006 | 17 | 0 | 83 |
| 2004 | na | na | na |
| 2002 | 79 | 0 | 21 |
| Hilton Head Recreation |
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| . | # of Parks | # of Parks (99 City Avg) |
| National Parks, Historic Sites, etc. (managed by National Park Service) |
Fort Sumter National Monument, Fort Pulaski National Monument plus 3 more | 7 |
| National Campgrounds, Lodges, etc. (other federal agency-managed sites) |
3 | 26 |
| State Parks, Sites, etc. | 1 | 11 |
| Hilton Head Climate (1971-2000) |
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| . | . | 99 City Avg | January - Avg Low Temp | 37 F | 27 F |
| January - Avg Daily Temp | 48 F | 37 F |
| July - Avg Daily Temp | 81 F | 74 F |
| July - Avg High Temp | 88 F | 86 F |
| Avg Annual Precipitation | 53 in | 35 in |
| Hilton Head Elevation | |
| 15 feet | GPTR 99 City Average 1,652 feet |
| Hilton Head Natural Hazards |
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| . | Risk Level | 99 City Average |
| Total Hazard Risk | Higher | Moderate |
| Earthquake | 1% | 10.9% |
| Tsunami | No Risk | No Risk |
| Hurricane | >60 | 10 |
| Flood | High | Very High |
| Tornado | Low | Low |
| Volcano | No Risk | No Risk |
| Wildfire | High | Low |
| Hilton Head Man-Made Hazards (Nuclear) |
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| Nuclear Power Stations (# Reactors) |
Distance from City | GPTR 99 City Average |
| Vogtle (2) | 80 miles | 50% of cities are within 100 miles of at least one nuclear station |
| Hilton Head Heating and Cooling Degree Days (avg annual) |
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| . | . | 99 City Avg |
| Total Degree Days | 4,122 | 5,915 |
| HDD | 2,110 | 4,662 |
| CDD | 2,012 | 1,253 |
Legend: Small green circles (older style maps) or multi-colored circles (newer style maps: click here for legend) indicate 1)Superfund Sites 2)Federal Facilities 3)RCRA Corrective Action Sites and 4)Brownfields Properties (EPA hazardous material cleanup sites defined at Environment link)
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| Carolina Beach has Similar Geography & Climate | Hot Springs Village is also Golf Country | Compare Other Temperate & Humid Retirement Cities | See more photos for Hilton Head |
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