City vs city
O'Fallon vs Saint Clair, MO
O'Fallon currently scores 6 points higher overall than Saint Clair, 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 · Saint Clair: 40/100
O'Fallon is 6 points higher.
Flood
O'Fallon: 44/100 · Saint Clair: 51/100
Saint Clair is 7 points higher.
O'Fallon: FEMA NFHL flood zones: 6 features intersect this tile.
Saint Clair: FEMA NFHL flood zones: 10 features intersect this tile.
Wind
O'Fallon: 16/100 · Saint Clair: 16/100
No gap.
O'Fallon: Wind exposure derived from ingested design wind / climatology tiles.
Saint Clair: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
O'Fallon: 46/100 · Saint Clair: 52/100
Saint Clair is 6 points higher.
O'Fallon: Lightning exposure derived from ingested climatology tiles.
Saint Clair: Lightning exposure derived from ingested climatology tiles.
Tornado
O'Fallon: 50/100 · Saint Clair: 12/100
O'Fallon is 38 points higher.
O'Fallon: Tornado risk derived from NOAA SPC historical reports.
Saint Clair: Tornado risk derived from NOAA SPC historical reports.
Hail
O'Fallon: 100/100 · Saint Clair: 84/100
O'Fallon is 16 points higher.
O'Fallon: Hail risk derived from NOAA SPC historical reports.
Saint Clair: Hail risk derived from NOAA SPC historical reports.
Storm surge
O'Fallon: Unavailable · Saint Clair: Unavailable
A score difference cannot be calculated without both sources.
O'Fallon: Storm surge model is not available for this location yet.
Saint Clair: Storm surge model is not available for this location yet.
Wildfire
O'Fallon: 41/100 · Saint Clair: 41/100
No gap.
O'Fallon: Wildfire exposure derived from ingested fire potential tiles.
Saint Clair: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
O'Fallon: 28/100 · Saint Clair: 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.
Saint Clair: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.