City vs city
Grafton vs Somerville, MA
Somerville currently scores 5 points higher overall than Grafton, 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
Grafton: 33/100 · Somerville: 38/100
Somerville is 5 points higher.
Flood
Grafton: 38/100 · Somerville: 30/100
Grafton is 8 points higher.
Grafton: FEMA NFHL flood zones: 9 features intersect this tile.
Somerville: FEMA NFHL flood zones: 9 features intersect this tile.
Wind
Grafton: 26/100 · Somerville: 27/100
Somerville is 1 points higher.
Grafton: Wind exposure derived from ingested design wind / climatology tiles.
Somerville: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grafton: 9/100 · Somerville: 10/100
Somerville is 1 points higher.
Grafton: Lightning exposure derived from ingested climatology tiles.
Somerville: Lightning exposure derived from ingested climatology tiles.
Tornado
Grafton: 0/100 · Somerville: 8/100
Somerville is 8 points higher.
Grafton: Tornado risk derived from NOAA SPC historical reports.
Somerville: Tornado risk derived from NOAA SPC historical reports.
Hail
Grafton: 38/100 · Somerville: 58/100
Somerville is 20 points higher.
Grafton: Hail risk derived from NOAA SPC historical reports.
Somerville: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grafton: Unavailable · Somerville: 82/100
A score difference cannot be calculated without both sources.
Grafton: Storm surge model is not available for this location yet.
Somerville: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Grafton: 57/100 · Somerville: 65/100
Somerville is 8 points higher.
Grafton: Wildfire exposure derived from ingested fire potential tiles.
Somerville: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grafton: 27/100 · Somerville: 26/100
Grafton is 1 points higher.
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.
Somerville: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.