> ...preventing me from buying sub-freezing temperature windshield wiper fluid

Actually you can buy and use that stuff in California, you just can't buy it in the valleys (which are warmer BTW) because the emissions cause smog. But in the sierras, where it's a safety issue and the topographic features are different, its available in every service station and car parts store. It's in in my gf's car right now.

The same sensible attitude works in reverse: some states ban studded winter tires because they rip up the roads. California allows them from November-April (longer in very snowy years) because they are safer in snow (and annoying as hell, especially in dry conditions, so you never encounter them at low altitude).