San Francisco (; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 331 U.S. cities proper with more than 100,000 residents, San Francisco was ranked first by per capita income (at $133,856) and fifth by aggregate income as of 2019. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.
San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 12th most populous metropolitan statistical area in the United States with 4.7 million residents, and the fourth-largest by economic output, with a GDP of $592 billion in 2019. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.6 million residents, and the third-largest by economic output, with a GDP of $0.5 trillion in 2020. Of the 105 primary statistical areas in the U.S. with over 500,000 residents, this CSA had the highest GDP per capita in 2019, at $112,910. In the same year, San Francisco proper had a GDP of $200.5 billion, and a GDP per capita of $228,118. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.
September is the hottest month ☀️, with average temperature of 63° degrees. January is the coldest month ❄️, with average temperature of 51° degrees. January is the wettest month 💧, with 4.41 In. of rain and/or snow.
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