City vs city
Hilton Head Island vs Port Royal, SC
Hilton Head Island currently scores 8 points higher overall than Port Royal, with the largest gap in hail.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Hilton Head Island: 53/100 · Port Royal: 45/100
Hilton Head Island is 8 points higher.
Flood
Hilton Head Island: 77/100 · Port Royal: 92/100
Port Royal is 15 points higher.
Hilton Head Island: FEMA NFHL flood zones: 19 features intersect this tile.
Port Royal: FEMA NFHL flood zones: 18 features intersect this tile.
Wind
Hilton Head Island: 46/100 · Port Royal: 45/100
Hilton Head Island is 1 points higher.
Hilton Head Island: Wind exposure derived from ingested design wind / climatology tiles.
Port Royal: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Hilton Head Island: 58/100 · Port Royal: 61/100
Port Royal is 3 points higher.
Hilton Head Island: Lightning exposure derived from ingested climatology tiles.
Port Royal: Lightning exposure derived from ingested climatology tiles.
Tornado
Hilton Head Island: 31/100 · Port Royal: 4/100
Hilton Head Island is 27 points higher.
Hilton Head Island: Tornado risk derived from NOAA SPC historical reports.
Port Royal: Tornado risk derived from NOAA SPC historical reports.
Hail
Hilton Head Island: 87/100 · Port Royal: 24/100
Hilton Head Island is 63 points higher.
Hilton Head Island: Hail risk derived from NOAA SPC historical reports.
Port Royal: Hail risk derived from NOAA SPC historical reports.
Storm surge
Hilton Head Island: 99/100 · Port Royal: 99/100
No gap.
Hilton Head Island: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Port Royal: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Hilton Head Island: 5/100 · Port Royal: 10/100
Port Royal is 5 points higher.
Hilton Head Island: Wildfire exposure derived from ingested fire potential tiles.
Port Royal: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Hilton Head Island: 21/100 · Port Royal: 21/100
No gap.
Hilton Head Island: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Port Royal: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.