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Portsmouth, Dominica
Full City Profile
3,633
Population
1,747/sq mi density
3 ft
Elevation
1 meters
77°F
Avg Temperature
25°C
Portsmouth has a warm climate with an average annual temperature of 77°F (25°C). Winters average 74°F in January while summers reach 79°F in July. The area gets 198 sunny days per year. Annual precipitation totals 76.3 inches. The area receives 0.0 inches of snow annually.
Temperature
74°F Jan (23°C)
79°F Jul (26°C)
| Annual Average | 77.1°F |
| 43% above US avg | |
| January Average | 74°F (23°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 198 days/yr |
Geography
| Elevation | 3 ft (1 m) |
| Area | 2.1 sq mi (5.4 km²) |
| Population Density | 1,747/sq mi |
| Coordinates | 15.5829°N, 61.4559°W |
| Timezone | America/Dominica |
Precipitation & Snow
Air Quality
Tsunami History
15 tsunamis recorded within 500 km. Highest wave on record: 5.0 m (16 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1902 | MOUNT PELEE | Explosion | 5.0 m | 23 | 90 km |
| 2003 | SOUFRIERE HILLS VOLCANO | Astronomical | 4.0 m | — | 148 km |
| 1902 | MOUNT PELEE | Astronomical | 4.0 m | — | 90 km |
| 1997 | WHITE RIVER VALLEY | Explosion | 3.0 m | — | 148 km |
| 1902 | MOUNT PELEE | Astronomical | 3.0 m | 1,500 | 90 km |
| 2004 | BASSE-TERRE, LES SAINTES | Earthquake | 2.0 m | 1 | 29 km |
| 1999 | SOUFRIERE HILLS VOLCANO | Astronomical | 2.0 m | — | 148 km |
| 1843 | POINTE-A-PITRE | Earthquake | 1.2 m | 5,000 | 129 km |
| 2006 | SOUFRIERE HILLS VOLCANO | Astronomical | 1.0 m | — | 148 km |
| 1902 | FORT-DE-FRANCE | Astronomical | 1.0 m | — | 117 km |
| 1902 | MARTINIQUE | Astronomical | 0.6 m | — | 124 km |
| 2005 | DOMINICA PASSAGE | Earthquake | — | — | 38 km |
| 1839 | MARTINIQUE | Earthquake | — | 390 | 119 km |
| 1823 | SAINT PIERRE | Earthquake | — | — | 140 km |
| 1767 | MARTINIQUE & BARBADOS | Earthquake | — | — | 140 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Diables, Morne aux (4 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Diables, Morne aux | Lava dome(s) | 861 m (2,825 ft) | Unknown | 4 km |
| Diablotins, Morne | Stratovolcano | 1,430 m (4,692 ft) | Unknown | 11 km |
| Trois Pitons, Morne | Complex | 1,387 m (4,551 ft) | 920 | 27 km |
| Watt, Morne | Stratovolcano(es) | 1,224 m (4,016 ft) | 1997 | 35 km |
| Plat Pays, Morne | Stratovolcano | 940 m (3,084 ft) | 1270 | 39 km |
| Soufriere Guadeloupe | Stratovolcano | 1,467 m (4,813 ft) | 1977 | 56 km |
| Pelee | Stratovolcano | 1,394 m (4,573 ft) | 1932 | 92 km |
| Soufriere Hills | Stratovolcano | 915 m (3,002 ft) | 2013 | 148 km |
| Qualibou | Caldera | 777 m (2,549 ft) | 1766 | 200 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 74°F (23°C) | 5.5 in | Coldest |
| February | 74°F (23°C) | 3.4 in | |
| March | 75°F (24°C) | 3.3 in | Driest |
| April | 77°F (25°C) | 3.5 in | |
| May | 78°F (26°C) | 5.4 in | |
| June | 79°F (26°C) | 6.4 in | |
| July | 79°F (26°C) | 6.4 in | |
| August | 79°F (26°C) | 8.5 in | Warmest |
| September | 79°F (26°C) | 9.1 in | |
| October | 78°F (26°C) | 8.6 in | |
| November | 77°F (25°C) | 9.2 in | Wettest |
| December | 75°F (24°C) | 7.0 in |
Portsmouth has a seasonal temperature swing of 5°F / from 74°F in January to 79°F in August. Total annual precipitation is 76.3 inches, with November being the wettest month (9.2") and March the driest (3.3").