It's been an unusually cool summer this year -- and if the folks at

are right, such seasons will become even less common as time marches on.

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declares: "Today, seven cities break 90°F on at least half of the days of a typical August; by the 2050's, they could be joined by Atlanta, Denver, Indianapolis, Miami and Philadelphia." Elsewhere,

gets specific about Denver. According to Climate Central's numbers, Denver averaged seven days over 90 degrees each August in the 1980s and 1990s -- a total that could rise to 22 by 2050. Likewise, the average of one August day over 95 degrees during the past two decades is predicted to reach twelve by mid-century. Start hoarding sunscreen immediately.