City vs city
Nashua vs Portsmouth, NH
Portsmouth currently scores 7 points higher overall than Nashua, 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
Nashua: 34/100 · Portsmouth: 41/100
Portsmouth is 7 points higher.
Flood
Nashua: 77/100 · Portsmouth: 73/100
Nashua is 4 points higher.
Nashua: FEMA NFHL flood zones: 26 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
Nashua: 23/100 · Portsmouth: 23/100
No gap.
Nashua: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Nashua: 7/100 · Portsmouth: 6/100
Nashua is 1 points higher.
Nashua: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
Nashua: 15/100 · Portsmouth: 0/100
Nashua is 15 points higher.
Nashua: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
Nashua: 51/100 · Portsmouth: 22/100
Nashua is 29 points higher.
Nashua: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Nashua: Unavailable · Portsmouth: 98/100
A score difference cannot be calculated without both sources.
Nashua: Storm surge model is not available for this location yet.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Nashua: 42/100 · Portsmouth: 43/100
Portsmouth is 1 points higher.
Nashua: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Nashua: 21/100 · Portsmouth: 23/100
Portsmouth is 2 points higher.
Nashua: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Portsmouth: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.