User blog comment:LoveWaffle/We Didn't See It Coming - Iron Man 3 and the Future of the MCU/@comment-5473242-20130513211957/@comment-1618941-20130516220900

ProfessorKilroy is right. It's an American term.

Additionally, citing Northern Hemisphere population percentages in support of some idea that a "Summer blockbuster" is predominant ignores the fact that equatorial regions don't operate in the same seasonal patterns, not to mention some populous regions observe six seasons rather than just four.