City vs city
Chatham vs Williamsville, IL
Chatham currently scores 4 points higher overall than Williamsville, 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
Chatham: 41/100 · Williamsville: 37/100
Chatham is 4 points higher.
Flood
Chatham: 39/100 · Williamsville: 38/100
Chatham is 1 points higher.
Chatham: FEMA NFHL flood zones: 6 features intersect this tile.
Williamsville: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Chatham: 16/100 · Williamsville: 16/100
No gap.
Chatham: Wind exposure derived from ingested design wind / climatology tiles.
Williamsville: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Chatham: 63/100 · Williamsville: 59/100
Chatham is 4 points higher.
Chatham: Lightning exposure derived from ingested climatology tiles.
Williamsville: Lightning exposure derived from ingested climatology tiles.
Tornado
Chatham: 15/100 · Williamsville: 31/100
Williamsville is 16 points higher.
Chatham: Tornado risk derived from NOAA SPC historical reports.
Williamsville: Tornado risk derived from NOAA SPC historical reports.
Hail
Chatham: 100/100 · Williamsville: 53/100
Chatham is 47 points higher.
Chatham: Hail risk derived from NOAA SPC historical reports.
Williamsville: Hail risk derived from NOAA SPC historical reports.
Storm surge
Chatham: Unavailable · Williamsville: Unavailable
A score difference cannot be calculated without both sources.
Chatham: Storm surge model is not available for this location yet.
Williamsville: Storm surge model is not available for this location yet.
Wildfire
Chatham: 23/100 · Williamsville: 33/100
Williamsville is 10 points higher.
Chatham: Wildfire exposure derived from ingested fire potential tiles.
Williamsville: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Chatham: 28/100 · Williamsville: 28/100
No gap.
Chatham: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Williamsville: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.