Of, intended for, or suggesting summer. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "summery" in a sentence
"The back flap summery is enough because anyone with basic knowledge of a tastless teenage romance could connect the dots of the story."
"One more to go (and she wants something "summery" - in beach/southwest type colours - the colours I think I have a fairly good idea of, but no idea what I'll do for the block yet; probably not this star, though) and I can tick August off the list."
"His summery was the police force was totally inadequate to meet the security challenges of modern India."