City vs city
Groton vs Old Greenwich, CT
Groton currently scores 6 points higher overall than Old Greenwich, with the largest gap in flood.
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
Groton: 43/100 · Old Greenwich: 37/100
Groton is 6 points higher.
Flood
Groton: 97/100 · Old Greenwich: 0/100
Groton is 97 points higher.
Groton: FEMA NFHL flood zones: 19 features intersect this tile.
Old Greenwich: FEMA NFHL flood zones: 0 features intersect this tile.
Wind
Groton: 35/100 · Old Greenwich: 25/100
Groton is 10 points higher.
Groton: Wind exposure derived from ingested design wind / climatology tiles.
Old Greenwich: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Groton: 9/100 · Old Greenwich: 18/100
Old Greenwich is 9 points higher.
Groton: Lightning exposure derived from ingested climatology tiles.
Old Greenwich: Lightning exposure derived from ingested climatology tiles.
Tornado
Groton: 0/100 · Old Greenwich: 0/100
No gap.
Groton: Tornado risk derived from NOAA SPC historical reports.
Old Greenwich: Tornado risk derived from NOAA SPC historical reports.
Hail
Groton: 6/100 · Old Greenwich: 10/100
Old Greenwich is 4 points higher.
Groton: Hail risk derived from NOAA SPC historical reports.
Old Greenwich: Hail risk derived from NOAA SPC historical reports.
Storm surge
Groton: 97/100 · Old Greenwich: 99/100
Old Greenwich is 2 points higher.
Groton: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Old Greenwich: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Groton: 27/100 · Old Greenwich: 64/100
Old Greenwich is 37 points higher.
Groton: Wildfire exposure derived from ingested fire potential tiles.
Old Greenwich: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Groton: 33/100 · Old Greenwich: 42/100
Old Greenwich is 9 points higher.
Groton: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Old Greenwich: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.