<Tr> <Td> 59 ° F (15 ° C) </Td> <Td> 61 ° F (16 ° C) </Td> <Td> 61 ° F (16 ° C) </Td> <Td> 62 ° F (17 ° C) </Td> <Td> 64 ° F (18 ° C) </Td> <Td> 67 ° F (19 ° C) </Td> <Td> 70 ° F (21 ° C) </Td> <Td> 72 ° F (22 ° C) </Td> <Td> 70 ° F (21 ° C) </Td> <Td> 68 ° F (20 ° C) </Td> <Td> 65 ° F (18 ° C) </Td> <Td> 62 ° F (17 ° C) </Td> </Tr> <P> The months of September through February bring warm winds from the desert called "Santa Anas". Occurring about 10 days out of the year, these winds bring sometimes hot, but always dry conditions . Inland, and in mountain passes and canyons, they can burst out in gusts of 100 miles per hour (160 km / h) and can lower relative humidity to single digits, although by the coast they rarely see gusts of over 40 miles per hour (64 km / h). They can spread and worsen wildfires . Because these winds blow from east to west, common perception is that they are pulling hot air from the desert . However, it is not uncommon during a Santa Ana condition for the coast to be even hotter than the desert regions . The Santa Ana winds are actually warm due to barometric pressure increases: As the air is pulled down to sea level from the higher altitudes of the Great Basin and Rocky Mountains to the east, it is compressed and its temperature rises . </P> <P> San Diego is only 3 ° further north than New Orleans, and technically within reach of East Pacific hurricanes . However, the cold California Current off the coast keeps ocean water significantly colder than in the Gulf of Mexico and western Atlantic . As a result, virtually all northbound hurricanes dissipate over Baja California and fail to bring any precipitation to San Diego . The only tropical cyclone known to impact San Diego as a hurricane in around 200 years of record - keeping was the 1858 San Diego Hurricane . Two more cyclones managed to bring tropical storm - force winds to Southern California: the 1939 California tropical storm and the Hurricane Kathleen (1976). </P> <P> During the months of May and June, a common natural occurrence brings a thin layer of clouds that covers coastal and inland communities . Some call it "May Gray", or "June Gloom". </P>

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