Climate

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 15 -20 degrees Celsius (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.