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San Francisco and northern San Mateo County, from NASA Landsat 7 San Francisco lies near the San Andreas Fault; a major source of earthquake activity in California. The most serious earthquake, in 1906, is mentioned above. Earlier significant quakes rocked the city in 1851, 1858, 1865, and 1868. The Daly City Earthquake of 1957 caused some damage. The Loma Prieta earthquake of 1989 which also did significant damage to parts of the city, is also famous for having interrupted a World Series baseball game between the Bay Area's two Major League Baseball teams, the San Francisco Giants and the Oakland Athletics.
The threat of another major earthquake like the 1906 one plays a major role in the city's infrastructure development. New buildings must be built to very high structural standards, while many dollars must be spent to retrofit the city's older buildings and bridges.
San Francisco is famous for its hills and the streets which run straight up and down them. Three of San Francisco's notable hill neighborhoods are Nob Hill, Russian Hill , and Telegraph Hill, all located in or near the downtown area.
Near the geographic center of the city and away from the downtown area, are a series of less populated hills. Dominating this area is Mount Sutro, which is the site of Sutro Tower, a large red and white radio transmission tower, that is a well known landmark to city residents. Nearby are the equally well known Twin Peaks , which are a pair of hills resting at one of the city's highest points.
Not to be missed are the beautiful homes and area of the city known as Pacific Heights. San Francisco is also famous for its cable cars ( narrow gauge, 1067 mm (3'6")), which were designed to carry residents up those steep hills. It is still possible to take a cable car ride up and down Nob and Russian Hills. Along with New Orleans' streetcars, San Francisco's cable cars are one of only two mobile United States National Monuments . Coit Tower, a notable landmark dedicated to San Francisco's firefighters, is located at the top of Telegraph Hill.
Surrounded on three sides by water, San Francisco's climate is strongly influenced by the cool currents of the Pacific Ocean. The weather is remarkably mild all year round, with a so-called Mediterranean climate characterized by cool, foggy summers and relatively warm winters; average daily high temperatures in the summer typically range from the upper 60s to low 70s Fahrenheit, while in the winter it virtually never reaches freezing. Rain in the summer is extremely rare, but winters can often be very rainy. Snow is virtually unheard of. The Pacific Ocean off the west coast of the city is particularly cold year round. The combination of cold ocean water and the high heat of the California mainland mean that San Francisco's western half is often shrouded in fog during the months of July and August. Thus, the summer temperatures are significantly lower in San Francisco than in other parts of inland California. The fog is less pronounced during the month of September, which is generally the warmest, most summer-like month of the year.
According to the United States Census Bureau, the city and county has a total area of 600.7 km˛ (231.9 mi˛). 120.9 km˛ (46.7 mi˛) of it is land and 479.7 km˛ (185.2 mi˛) of it is water. The total area is 79.86% water. The city itself is often reputed to be roughly a seven mile by seven mile square, but in fact it is slightly smaller, 46.7 mi˛.
The geographical center of the city is on the east side of Grandview Avenue between Alvarado and Twenty-third Streets.
Some 40 miles south of San Francisco is the Silicon Valley, which holds much of the computing business in the world.
Because of the California gold rush, San Francisco became and remains the banking and financial center of the U.S. West Coast. It is the home of the twelfth district of the U.S. Federal Reserve as well as major production facilities for the U.S. Mint. The Pacific Exchange, a regional stock exchange, is located in the financial district. Many major American and international banks and venture capital firms have all set up their regional headquarters in the city.