Alter do Chão, Portugal

Full City Profile

2,600 Population 38/sq mi density

883 ft Elevation 269 meters

61°F Avg Temperature 16°C

Alter do Chão enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 49°F in January while summers reach 75°F in July. The area gets 288 sunny days per year. Annual precipitation totals 26.5 inches. The area receives 0.0 inches of snow annually.

Temperature

49°F Jan (9°C) 75°F Jul (24°C)

Annual Average	60.6°F
	12% above US avg
January Average	49°F (9°C)
July Average	75°F (24°C)
Sunny Days	288 days/yr

Geography

Elevation	883 ft (269 m)
Area	69.1 sq mi (178.9 km²)
Population Density	38/sq mi
Coordinates	39.1974°N, 7.6589°W
Timezone	Europe/Lisbon

Precipitation & Snow

Annual Rainfall 26.5"

30% below US avg

Snowfall 0.0"

Wettest Month (Dec) 3.86"

Driest Month (Jul) 0.20"

Air Quality

Earthquake History

86 earthquakes (M2.5+) within 150 km since 1990. Strongest: M4.8. Most recent: M2.9 on Apr 16, 2025.

Feb 17, 2025	1 km NE of Charneca de Caparica, Portugal	M4.8	146 km
Aug 17, 2017	5 km N of Arruda dos Vinhos, Portugal	M4.2	124 km
Mar 27, 2010	13 km SE of Vale da Amoreira, Portugal	M4.1	26 km
Jan 22, 2006	0 km SE of Feria, Spain	M4.1	122 km
Jan 15, 2018	25 km NNW of Évora, Portugal	M4.1	52 km
Jul 31, 1998	23 km W of Estremoz, Portugal	M3.8	40 km
Apr 10, 2001	6 km SSE of Louriçal, Portugal	M3.7	122 km
Sep 4, 1996	4 km E of Santo Isidoro, Portugal	M3.6	148 km
Jan 19, 1997	9 km WNW of Redondo, Portugal	M3.6	57 km
Apr 30, 1999	7 km WNW of Marinha Grande, Portugal	M3.6	133 km
Feb 18, 1990	2 km ENE of Abrigada, Portugal	M3.6	115 km
Feb 1, 2017	4 km WSW of Porto de Mós, Portugal	M3.6	113 km
Jan 11, 2005	12 km WSW of Montemor-o-Novo, Portugal	M3.5	89 km
Sep 21, 1992	1 km N of Salvaleón, Spain	M3.5	107 km
Jun 20, 1991	3 km SE of Tavarede, Portugal	M3.5	145 km
Feb 14, 1996	15 km SSW of Évora, Portugal	M3.5	88 km
Dec 31, 1996	4 km N of Luso, Portugal	M3.5	150 km
Apr 15, 2006	3 km N of Bombarral, Portugal	M3.4	130 km
Mar 20, 2002	13 km NNE of Montemor-o-Novo, Portugal	M3.3	66 km
Mar 18, 2021	0 km SSW of Santa Iria da Azóia, Portugal	M3.3	131 km

Source: USGS (M2.5+, 1990–2025)

Tsunami History

1 tsunami recorded within 500 km.

Year	Location	Cause	Max Wave	Deaths	Distance
1531	TAGUS RIVER, LISBON	Earthquake	—	30,000	136 km

Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (9°C)	3.6 in	Coldest
February	50°F (10°C)	2.9 in
March	54°F (12°C)	2.6 in
April	56°F (13°C)	2.4 in
May	62°F (16°C)	2.1 in
June	69°F (21°C)	0.9 in
July	75°F (24°C)	0.2 in	Warmest, Driest
August	75°F (24°C)	0.3 in
September	71°F (22°C)	1.3 in
October	62°F (17°C)	2.9 in
November	55°F (13°C)	3.5 in
December	50°F (10°C)	3.9 in	Wettest

Alter do Chão has a seasonal temperature swing of 27°F / from 49°F in January to 75°F in July. Total annual precipitation is 26.5 inches, with December being the wettest month (3.9") and July the driest (0.2").

View full weather details →