LOL! I'm amused at how many folks consider their particular area the "Banana Belt". Truth be known there are BB's all over the USA. As far south Vista, CA renouned for it's "MIcro" Banana belt climate with an average year around temp of 72 degrees, over 300 days a year of sunshine and less than 14 inches of annual rainfall.
And as far North as Sequim, WA, aka "The Blue Hole" named by pilots flying over the area from Seattle to Vancouver BC who alwas noted how the sky opened up whence flying over Sequim. The average annual rainfall is around 16 inches and the average year around climate is in the high 60's and it seldom snows.
Unlike many opinions so far Banana Belts are not exclusive to the California Coast or the Pacific Coast for that matter. There's BB's in the Black Hills and even in areas of Montana and on the East Coast. Take a look at the Wikipedia definition provided by Deborah below.