City vs city
Groton vs Northwest Harwinton, CT
Groton currently scores 24 points higher overall than Northwest Harwinton, 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 · Northwest Harwinton: 19/100
Groton is 24 points higher.
Flood
Groton: 97/100 · Northwest Harwinton: 3/100
Groton is 94 points higher.
Groton: FEMA NFHL flood zones: 19 features intersect this tile.
Northwest Harwinton: FEMA NFHL flood zones: 1 features intersect this tile.
Wind
Groton: 35/100 · Northwest Harwinton: 23/100
Groton is 12 points higher.
Groton: Wind exposure derived from ingested design wind / climatology tiles.
Northwest Harwinton: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Groton: 9/100 · Northwest Harwinton: 13/100
Northwest Harwinton is 4 points higher.
Groton: Lightning exposure derived from ingested climatology tiles.
Northwest Harwinton: Lightning exposure derived from ingested climatology tiles.
Tornado
Groton: 0/100 · Northwest Harwinton: 19/100
Northwest Harwinton is 19 points higher.
Groton: Tornado risk derived from NOAA SPC historical reports.
Northwest Harwinton: Tornado risk derived from NOAA SPC historical reports.
Hail
Groton: 6/100 · Northwest Harwinton: 28/100
Northwest Harwinton is 22 points higher.
Groton: Hail risk derived from NOAA SPC historical reports.
Northwest Harwinton: Hail risk derived from NOAA SPC historical reports.
Storm surge
Groton: 97/100 · Northwest Harwinton: Unavailable
A score difference cannot be calculated without both sources.
Groton: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Northwest Harwinton: Storm surge model is not available for this location yet.
Wildfire
Groton: 27/100 · Northwest Harwinton: 18/100
Groton is 9 points higher.
Groton: Wildfire exposure derived from ingested fire potential tiles.
Northwest Harwinton: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Groton: 33/100 · Northwest Harwinton: 28/100
Groton is 5 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.
Northwest Harwinton: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.