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Los
Angeles has a two-season climate; summers are usually hot and dry, with most of
the precipitation arriving in winter. Temperatures are moderated by the Pacific
Ocean, and communities away from the shore, particularly in the valleys, are
generally hotter in summer. In late summer and fall the hot, dry winds called
the "Santa Ana Winds" blow down from the mountains in the east. In January the average
high temperature is 19°C (66°F) and the average low is 9°C (48°F); in July
highs average 24°C (75°F) and lows average 17°C (63°F). With an average
yearly precipitation of only 305 mm (12 in), supplying water for the drinking,
cleaning, and industrial needs of millions of people is a continuous problem.

Los
Angeles grew from a farming settlement established by the Spanish in 1781 and
named El Pueblo Nuestra Señora la Reina de los Ángeles de Porciúncula
(the town of Our Lady Queen of Angels of Porciuncula). Throughout the next
century it remained a somewhat sleepy agricultural town. But in the 20th century
Los Angeles began to embody a style of living desired by the people of the
nation. Its warm climate and economic opportunities drew newcomers from across
the country and much of the world, making the city a vibrant and constantly
changing place. The rapid growth also created problems. Los Angeles is beset by
air pollution and traffic congestion, divided by racial and economic inequities,
and lacking in a sense of permanence found in slower-growing communities. Still,
the rich mix of people from many different cultures and the role the city plays
in providing much of the country's entertainment makes Los Angeles a fountain of
trends and ideas for the nation and the entire world.
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