Take "Summer" for example. Summer is "Hot", "Sticky" and "Fun". So, I suppose people basically felt that any adjective that describes a hot, fun time is appropriate for summer.
Hmm... this occasionally goes.... wrong.

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I love it when my spirits are raised and the city comes energetically. It's so throbbingly hot. I'm not sure what bon-odori is, but I'm pretty sure it means "naked and sweaty"
