That’s one of the hardest things about leaving California as a lifelong Californian who is accustomed to Mediterranean climates: there’s nowhere else in the United States with this type of climate. It’s generally your choice of cold winters (much of the northern US), very humid summers (the South and the East Coast), or a very long rainy season (the Pacific Northwest). Even the weather of California’s Central Valley, which has hot, dry summers, is a vast improvement over much of the rest of the country.
It’s not that I can’t deal with the weather; I dream of living in the Tokyo area again despite its brutally hot and humid summers. But it’s going to be difficult giving up a Mediterranean climate.
With California out of the picture, people are considering other areas that have decent weather and these areas are also getting more expensive. I won't say it so more people don't come here, but there are other places in the US with mild weather (of course not as mild as California's, but still pretty good) :).
Harsh winters and humid summers are quite miserable. People are less likely to want to go out, certain businesses are closed, specific activities are not possible, etc.
The amount of “nice days” you get in CA is much greater than elsewhere in the US.
It’s not that I can’t deal with the weather; I dream of living in the Tokyo area again despite its brutally hot and humid summers. But it’s going to be difficult giving up a Mediterranean climate.