what is the time zone in california called?
Pacific Time Zone
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 Among major U.S. cities , San Francisco has the coolest daily mean , maximum , and minimum temperatures for June , July , and August . During the summer , rising hot air in California 's interior valleys creates a low pressure area that draws winds from the North Pacific High through the Golden Gate , which creates the city 's characteristic cool winds and fog . The fog is less pronounced in eastern neighborhoods and during the late summer and early fall , which is the warmest time of the year . 

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 The state of California is located on the Pacific Ring of Fire , an area of highly active tectonic activity that includes seismicity and volcanism . Tehama and the other volcanoes near Lassen Peak were produced by subduction of the oceanic Pacific Plate under the North American Plate . 

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 California was quickly granted statehood , and the U.S. military built Fort Point at the Golden Gate and a fort on Alcatraz Island to secure the San Francisco Bay . Silver discoveries , including the Comstock Lode in 1859 , further drove rapid population growth . With hordes of fortune seekers streaming through the city , lawlessness was common , and the Barbary Coast section of town gained notoriety as a haven for criminals , prostitution , and gambling . 

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 In the USA , The Smithsonian Institution developed its network of observers over much of the central and eastern United States between the 1840s and 1860s once Joseph Henry took the helm . The U.S. Army Signal Corps inherited this network between 1870 and 1874 by an act of Congress , and expanded it to the west coast soon afterwards . At first , not all the data on the map was used due to a lack of time standardization . The United States fully adopted time zones in 1905 , when Detroit finally established standard time . 

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 With an estimated population of 1 @,@ 394 @,@ 928 as of July 1 , 2015 , San Diego is the eighth @-@ largest city in the United States and second @-@ largest in California . It is part of the San Diego – Tijuana conurbation , the second @-@ largest transborder agglomeration between the US and a bordering country after Detroit – Windsor , with a population of 4 @,@ 922 @,@ 723 people . San Diego is the birthplace of California and is known for its mild year @-@ round climate , natural deep @-@ water harbor , extensive beaches , long association with the United States Navy and recent emergence as a healthcare and biotechnology development center . 
