City vs city
Grafton vs Onset, MA
Onset currently scores 4 points higher overall than Grafton, with the largest gap in wildfire.
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
Grafton: 33/100 · Onset: 37/100
Onset is 4 points higher.
Flood
Grafton: 38/100 · Onset: 58/100
Onset is 20 points higher.
Grafton: FEMA NFHL flood zones: 9 features intersect this tile.
Onset: FEMA NFHL flood zones: 19 features intersect this tile.
Wind
Grafton: 26/100 · Onset: 36/100
Onset is 10 points higher.
Grafton: Wind exposure derived from ingested design wind / climatology tiles.
Onset: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grafton: 9/100 · Onset: 13/100
Onset is 4 points higher.
Grafton: Lightning exposure derived from ingested climatology tiles.
Onset: Lightning exposure derived from ingested climatology tiles.
Tornado
Grafton: 0/100 · Onset: 0/100
No gap.
Grafton: Tornado risk derived from NOAA SPC historical reports.
Onset: Tornado risk derived from NOAA SPC historical reports.
Hail
Grafton: 38/100 · Onset: 13/100
Grafton is 25 points higher.
Grafton: Hail risk derived from NOAA SPC historical reports.
Onset: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grafton: Unavailable · Onset: 99/100
A score difference cannot be calculated without both sources.
Grafton: Storm surge model is not available for this location yet.
Onset: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Grafton: 57/100 · Onset: 12/100
Grafton is 45 points higher.
Grafton: Wildfire exposure derived from ingested fire potential tiles.
Onset: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grafton: 27/100 · Onset: 27/100
No gap.
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.
Onset: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.