Elevation
Portsmouth elevation and altitude
Portsmouth, New Hampshire is 20 feet (6 meters) above sea level. Elevation and altitude mean the same thing here: the height of the city above the sea.
What 20 feet means in Portsmouth
Among the 689 cities on this site, Portsmouth is one of the lowest. At 20 ft the thinner air is not something most people notice day to day.
Air pressure. Air pressure falls as you climb, about 1 inHg for every 1,000 ft near the ground. In Portsmouth a barometer that is not corrected to sea level reads around 29.90 inHg on an average day, while the weather forecast still quotes a sea-level number near 29.92 inHg. See today’s live barometric pressure in Portsmouth.
Cooking. Water boils at about 212 °F (100.0 °C) here, almost the same as at sea level. Boiling point at altitude
Where the number comes from. The elevation is for the city center point in the GeoNames gazetteer, taken from a digital elevation model. To check the exact height where you are standing, use What is my elevation? or What is my altitude?
Elevation of places near Portsmouth
| Place | Elevation (ft) | Elevation (m) | Distance |
|---|---|---|---|
| Manchester, New Hampshire | 262 | 80 | 36 mi |
| Concord, New Hampshire | 272 | 83 | 40 mi |
| Lowell, MA | 118 | 36 | 42 mi |
| Nashua, New Hampshire | 161 | 49 | 42 mi |
| Portland, ME | 62 | 19 | 47 mi |
| Boston, MA | 46 | 14 | 52 mi |
| North Conway, New Hampshire | 525 | 160 | 70 mi |
| Worcester, MA | 482 | 147 | 77 mi |
Frequently asked questions
What is the elevation or altitude of Portsmouth?
Portsmouth, New Hampshire is about 20 feet (6 meters) above sea level, measured at the city center. Neighborhoods higher or lower in the city can differ by a few hundred feet.
What is the air pressure in Portsmouth because of its elevation?
On a standard day the air pressure at 20 ft is about 29.90 inHg (1013 hPa), 100% of sea-level pressure. Each breath holds about 100% as much oxygen as at sea level. Live barometric pressure in Portsmouth.
At what temperature does water boil in Portsmouth?
About 212 °F (100.0 °C), compared with 212 °F (100 °C) at sea level, so pasta, eggs and beans take a little longer to cook.