Comparing Florida weather to weather "up north" was a popular topic on Florida postcards of the linen era. Some of the other postcards in this category compare picking oranges to throwing snowballs, water skiing to snow skiing, or sun to ice.
Actually it has been known to snow in Florida, but not very often. There was one of the rare snow events this week. The Associated Press reported on January 3, 2008: "Flurries fell across the Sunshine State today, but it appeared that growers were spared the deep freeze they feared would devastate the nation’s citrus supply."
Wikipedia has a list of other snow events in Florida.
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