Beware the Odd Angles
The climate is mild and abundantly green throughout the year; the average temperature is 59 degrees in the summer, 51 degrees in the winter. Rain is an ever-present threat; San Francisco gets an average of 20.52 inches of rain, with almost constant winter storms dumping an average of 3.6 inches monthly. The terrain is markedly different all around the bay: the rolling hills of the South and East Bay and the thickly forested valleys of the north stand in marked contrast to the tip of the San Francisco peninsula, which was a desolate lunar landscape of towering sand dunes and scrub brush.
San Francisco, however, is a city of microclimates, pockets between the hills and along the coves and beaches where the weather can vary dramatically. It is possible for there to be a drizzling rain west of Twin Peaks while the downtown is sunny. A “pocket”, particularly along the ocean side or along Chinatown-North Beach, may be filled with a dense, cottony fog while the rest of the city is clear. Potrero Hill is enjoyed by the Bohemian set, artists and the like, as being the sunniest part of the city. Half of it has yet to be built up, and rents are cheap.
An urban legend has it that time loses focus in the fog. There are innumerable stories about people going for solitary walks and wandering into minor historical events, such as one of the famous duels, or being buttonholed for a chat by someone during a dawn walk who vanishes when sunlight hits him.