It has more to do with how well prepared a city is and what plans they have in place BEFORE a storm. Also what their budget is.
NYC has humongous budgets for snow. The snow plow drivers get
massive overtime to put the plows on the garbage trucks, then to drive them. They also can't be plowing and picking up garbage at the same time, so they have to go around again
after they've plowed to do garbage runs.
I don't think CA even has salt spreaders???

So they wouldn't even have bought salt.
And what is this need in CA for ALL cars to put CHAINS on tires for 2" of snow in snowy areas?

If people's driver's license can prove they are actually from a snow belt state, we should be allowed to drive in your snow without chains. ALL cars shouldn't be required to have them. We northerners laugh at 2" of snow & ice.
I lived in CA for a few years. I've seen cars with flipped over or crunched up cars (like during a blizzard,) for driving in the
rain. 
There's no excuse for that. Driver's Ed should pull out a garden hose and wet the roads down to teach CA drivers how to drive on
wet, slick roads.