I am an east coast transplant to California, what surprised by about California weather was
a) no thunderstorms....on the east coast we had storms almost every day in the summer now after 10 years I only remember one thunderstorm where I could see and hear the lightning and thunder
b) how weird is it that we get weather reports by altitude.....first time I heard it...I had to think about why
c) there really is a rainy season and the rest of the year, you are lucky if the humidity rises to 15%
d) that rainy season might be a little rain everyday for 60+ days....or you might get all of the rain for the entire year in 5 storms
e) one time the rain and runoff was so strong that I found my front year at the bottom of the hill next to my neighbors house... seriously the topsoil and mulch ran off my front lawn, out my driveway, down the gutter to the storm drain at the bottom of the hill
f) snow doesn't have to be icy...I learned to ice in the northeast...I never ran into powder....and here, I its the opposite unless its a very sunny cold day
g) in the summer, the high temperature versus the low temperature varies 40-50 degrees each day. no hot, muggy nights (or more accurately no hot muggy nights most years
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Often people get SAD (Seasonal Affective Disorder) in the winter-- I get it in the summer. Honestly!!
But I've always been reminded that a dry heat is a thousand times more bearable than a humid heat.
And I know that's true, so I am grateful that, though summers here (Northern Calif) can be hot, at least the
humidity is low.
Then, of course, there's the danger of wildfires, but that's another story. 
Being a native Californian, I was amazed to discover that other parts of the country get RAIN all year. 
Just my 2 cents worth 
