Just Wondering

I'm wondering where the best city to live in would be if you only factored in year-round weather. Florida has hurricanes. California has earthquakes and gazillion "micro-climates." The northwest has rain. The South has high humidity in the summers. The heartland has deep snow in winter. Texas has brutal summer heat. You get the idea.

I've heard San Diego might be the best city to live in if you only factored in weather or "natural" environmental concerns (earthquakes, hurricanes, etc.). Which city do you think is the best city for overall climate?