There are about 20 days of frost each year, and almost 60 in the west hills area (some 300 mts above the sea level). Snowfall is not uncommon, but snow accumulation on the ground is rare, a phenomenon that takes place every 6 years or so, according to the last 40 year's data.
Among the most best known such occurrences were the 1975 and 1991 snowstorms, but there were also snow accumulations in 1994 and 1997, in the highest hills area of Sierra de los Padres, in 1995 along the southern coast, and other two during the first hours of July 10, 2004 and July 15, 2010. There were two flurries in September 1986 and June 2007. There is fog in the last days of fall, and springtime is often marred by sea winds and sudden temperature's changes. There are some ten days of 30°C (86 Fahrenheit) each summer, certainly milder values than the rest of the pampas region. Usually, the summer nights are cool and pleasant, with values between 13º to 17°C (55 to 63 Fahrenheit). The record high is 41º on January 1957 (105 Fahrenheit). The wet season occurs during spring and summer, specially in January, with values between the 70 and 80 mm. The average annual rainfall is 780 mm.
