I get heat warnings every other day lately, and unless it's the rare cloudy day my UV index is at the top of the scale. I don't worry about snow here, I worry about heat and sun. I don't see a good solution for that unless you want to build covered bike routes with ventilation fans all through the metroplex?

For me it's moreso the cold. But the act of biking should warm you up anyway. I think it really depends. The pathways are definitely clear, the question is if the weather would make someone drive vs bike.