Ber, We don't really have a hard thermocline, it was 68-69 on the surface and gradually went to 59 at 65' fsw, last Saturday. Pack for cool water.
What? No "so defined you can see its haze, stick your hand in it and freeze because it's 20 degrees colder than the water your body is in" thermocline? You're trying to spoil me aren't you Ber :lilbunny:
It does happen - sometimes but not to that extent.
BTW, You know what they say, once you have been diving in California, you may never go back!