My experience.
East Bay across from San Francisco is great for spectacular road biking, but commuting is tough with all the hills, climate is perfect, drivers are ok.
Madison Wisconsin. When I was last there many years ago, it was the most bicycle friendly town I've been in. Drivers great, commutes are easy. The weather is not that bad. I got used to riding very comfortably down to about 15 degrees. Even commuted in -20 degree weather, but luckily, not too many of those days.
Miami Florida. Great weather all year round, flat, so commutes are easy. Drivers are the worst I've ever seen. Not that they are negligent, which they are, but many here go out of their way to buzz you, cut you off, pull out in front of you when you have the right of way.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1