What's the climate like in San Francisco? Is it comfortable? Livable?

Due to the long-term influence of sea breeze on the San Francisco Peninsula, the daily high temperature in summer is usually only about 20 degrees, occasionally reaching more than 30 degrees, but only for a few days, and the temperature difference between morning and evening is very large, and it may drop below 10 degrees in midsummer. Because San Francisco is close to the seaside and the Golden Gate Strait, it is often foggy in the middle of the night and in the morning. San Francisco (California) has no four seasons, only dry season and rainy season. It enters the rainy season around Ghost Festival every year until the dry season in March and April of the following year. It is not very cold in winter, with an average of about 5- 15 degrees, and occasionally it will drop to 0 degrees in a few days, which is very suitable for living. However, San Francisco is located on the earthquake fault, which is a high-frequency earthquake area, and people are used to frequent small earthquakes.