City vs city
Portsmouth vs Somersworth, NH
Portsmouth currently scores 1 points higher overall than Somersworth, 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 is a current EPA AirNow signal; 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
Portsmouth: 41/100 · Somersworth: 40/100
Portsmouth is 1 points higher.
Flood
Portsmouth: 73/100 · Somersworth: 30/100
Portsmouth is 43 points higher.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Somersworth: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Portsmouth: 23/100 · Somersworth: 21/100
Portsmouth is 2 points higher.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Somersworth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Portsmouth: 6/100 · Somersworth: 6/100
No gap.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Somersworth: Lightning exposure derived from ingested climatology tiles.
Tornado
Portsmouth: 0/100 · Somersworth: 8/100
Somersworth is 8 points higher.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Somersworth: Tornado risk derived from NOAA SPC historical reports.
Hail
Portsmouth: 22/100 · Somersworth: 100/100
Somersworth is 78 points higher.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Somersworth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Portsmouth: 98/100 · Somersworth: 97/100
Portsmouth is 1 points higher.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Somersworth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Portsmouth: 43/100 · Somersworth: 36/100
Portsmouth is 7 points higher.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Somersworth: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Portsmouth: 23/100 · Somersworth: 23/100
No gap.
Portsmouth: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Somersworth: Air quality signal derived from the latest EPA AirNow combined AQI grid.