The part of California I lived in was the middle or central part. I was in a valley not more than 20 miles from the ocean and on Christmas it was about 45 degrees in the morning with a bit of frost and got up to 65 degrees by noon. I'm sorry I can't give you the metric equivalent. But it really depends on where you live and the altitude in California as to whether or not you see snow. For instance, from where I lived you could see Fremonts Peak which had snow on it every year and I could drive up to see it.
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