City vs city
San Diego vs St. Helena, CA
St. Helena currently scores 1 points higher overall than San Diego, with the largest gap in wildfire.
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
San Diego: 22/100 · St. Helena: 23/100
St. Helena is 1 points higher.
Flood
San Diego: 39/100 · St. Helena: 31/100
San Diego is 8 points higher.
San Diego: FEMA NFHL flood zones: 14 features intersect this tile.
St. Helena: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
San Diego: 6/100 · St. Helena: 2/100
San Diego is 4 points higher.
San Diego: Wind exposure derived from ingested design wind / climatology tiles.
St. Helena: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
San Diego: 1/100 · St. Helena: 0/100
San Diego is 1 points higher.
San Diego: Lightning exposure derived from ingested climatology tiles.
St. Helena: Lightning exposure derived from ingested climatology tiles.
Tornado
San Diego: 12/100 · St. Helena: 0/100
San Diego is 12 points higher.
San Diego: Tornado risk derived from NOAA SPC historical reports.
St. Helena: Tornado risk derived from NOAA SPC historical reports.
Hail
San Diego: 5/100 · St. Helena: 1/100
San Diego is 4 points higher.
San Diego: Hail risk derived from NOAA SPC historical reports.
St. Helena: Hail risk derived from NOAA SPC historical reports.
Storm surge
San Diego: Unavailable · St. Helena: Unavailable
A score difference cannot be calculated without both sources.
San Diego: Storm surge model is not available for this location yet.
St. Helena: Storm surge model is not available for this location yet.
Wildfire
San Diego: 69/100 · St. Helena: 56/100
San Diego is 13 points higher.
San Diego: Wildfire exposure derived from ingested fire potential tiles.
St. Helena: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
San Diego: 24/100 · St. Helena: 26/100
St. Helena is 2 points higher.
San Diego: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
St. Helena: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.