The California Thanksgiving Freezes

Since most of the Thanksgivings in my life since I was 4 years old and first moved to California with my family from Seattle, I have noticed that some of the coldest temperatures of the year almost always arrive just around Thanksgiving. There seems to be a window between Halloween and Thanksgiving to get the coldest temperatures. I have never really understood why this is. Maybe it is that if there are any storms there is a lot of wind and so there aren't a lot of clouds slowly moving by or high or low fog to keep all the heat from flying off the ground and off into space. Maybe that's part of it. Or maybe the arctic storms this time of year dive deeper into the western states and really sort of put the fear of God into us (or just the fear of a really cold winter). Any way you look at it it is very very cold for Northern California here on the Pacific Coast (relatively speaking) and much much worse to the north and the east of us for hundreds and thousands of miles.