City vs city
O'Fallon vs St. Louis, MO
O'Fallon currently scores 8 points higher overall than St. Louis, with the largest gap in tornado.
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
O'Fallon: 46/100 · St. Louis: 38/100
O'Fallon is 8 points higher.
Flood
O'Fallon: 44/100 · St. Louis: 32/100
O'Fallon is 12 points higher.
O'Fallon: FEMA NFHL flood zones: 6 features intersect this tile.
St. Louis: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
O'Fallon: 16/100 · St. Louis: 16/100
No gap.
O'Fallon: Wind exposure derived from ingested design wind / climatology tiles.
St. Louis: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
O'Fallon: 46/100 · St. Louis: 39/100
O'Fallon is 7 points higher.
O'Fallon: Lightning exposure derived from ingested climatology tiles.
St. Louis: Lightning exposure derived from ingested climatology tiles.
Tornado
O'Fallon: 50/100 · St. Louis: 15/100
O'Fallon is 35 points higher.
O'Fallon: Tornado risk derived from NOAA SPC historical reports.
St. Louis: Tornado risk derived from NOAA SPC historical reports.
Hail
O'Fallon: 100/100 · St. Louis: 100/100
No gap.
O'Fallon: Hail risk derived from NOAA SPC historical reports.
St. Louis: Hail risk derived from NOAA SPC historical reports.
Storm surge
O'Fallon: Unavailable · St. Louis: Unavailable
A score difference cannot be calculated without both sources.
O'Fallon: Storm surge model is not available for this location yet.
St. Louis: Storm surge model is not available for this location yet.
Wildfire
O'Fallon: 41/100 · St. Louis: 38/100
O'Fallon is 3 points higher.
O'Fallon: Wildfire exposure derived from ingested fire potential tiles.
St. Louis: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
O'Fallon: 28/100 · St. Louis: 27/100
O'Fallon is 1 points higher.
O'Fallon: 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. Louis: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.