City vs city
Marthasville vs Saint Clair, MO
Marthasville and Saint Clair are tied on overall score, with the biggest factor difference 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
Marthasville: 40/100 · Saint Clair: 40/100
No gap.
Flood
Marthasville: 57/100 · Saint Clair: 51/100
Marthasville is 6 points higher.
Marthasville: FEMA NFHL flood zones: 4 features intersect this tile.
Saint Clair: FEMA NFHL flood zones: 10 features intersect this tile.
Wind
Marthasville: 16/100 · Saint Clair: 16/100
No gap.
Marthasville: Wind exposure derived from ingested design wind / climatology tiles.
Saint Clair: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Marthasville: 50/100 · Saint Clair: 52/100
Saint Clair is 2 points higher.
Marthasville: Lightning exposure derived from ingested climatology tiles.
Saint Clair: Lightning exposure derived from ingested climatology tiles.
Tornado
Marthasville: 0/100 · Saint Clair: 12/100
Saint Clair is 12 points higher.
Marthasville: Tornado risk derived from NOAA SPC historical reports.
Saint Clair: Tornado risk derived from NOAA SPC historical reports.
Hail
Marthasville: 62/100 · Saint Clair: 84/100
Saint Clair is 22 points higher.
Marthasville: Hail risk derived from NOAA SPC historical reports.
Saint Clair: Hail risk derived from NOAA SPC historical reports.
Storm surge
Marthasville: Unavailable · Saint Clair: Unavailable
A score difference cannot be calculated without both sources.
Marthasville: Storm surge model is not available for this location yet.
Saint Clair: Storm surge model is not available for this location yet.
Wildfire
Marthasville: 27/100 · Saint Clair: 41/100
Saint Clair is 14 points higher.
Marthasville: Wildfire exposure derived from ingested fire potential tiles.
Saint Clair: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Marthasville: 27/100 · Saint Clair: 27/100
No gap.
Marthasville: 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.