City vs city
Chelsea vs Grafton, MA
Chelsea currently scores 6 points higher overall than Grafton, 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
Chelsea: 39/100 · Grafton: 33/100
Chelsea is 6 points higher.
Flood
Chelsea: 48/100 · Grafton: 38/100
Chelsea is 10 points higher.
Chelsea: FEMA NFHL flood zones: 21 features intersect this tile.
Grafton: FEMA NFHL flood zones: 9 features intersect this tile.
Wind
Chelsea: 27/100 · Grafton: 26/100
Chelsea is 1 points higher.
Chelsea: Wind exposure derived from ingested design wind / climatology tiles.
Grafton: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Chelsea: 10/100 · Grafton: 9/100
Chelsea is 1 points higher.
Chelsea: Lightning exposure derived from ingested climatology tiles.
Grafton: Lightning exposure derived from ingested climatology tiles.
Tornado
Chelsea: 15/100 · Grafton: 0/100
Chelsea is 15 points higher.
Chelsea: Tornado risk derived from NOAA SPC historical reports.
Grafton: Tornado risk derived from NOAA SPC historical reports.
Hail
Chelsea: 30/100 · Grafton: 38/100
Grafton is 8 points higher.
Chelsea: Hail risk derived from NOAA SPC historical reports.
Grafton: Hail risk derived from NOAA SPC historical reports.
Storm surge
Chelsea: 98/100 · Grafton: Unavailable
A score difference cannot be calculated without both sources.
Chelsea: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Grafton: Storm surge model is not available for this location yet.
Wildfire
Chelsea: 57/100 · Grafton: 57/100
No gap.
Chelsea: Wildfire exposure derived from ingested fire potential tiles.
Grafton: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Chelsea: 26/100 · Grafton: 27/100
Grafton is 1 points higher.
Chelsea: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Grafton: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.