Happy, sunny. Something that makes you happy is cheery, and people are cheery when they are in a good mood.
Cheery is an old fashioned term, and is now used primarily in sarcastic comments, where the word "cheery" actually means "depressing."
As in:
"I heard you whistling. You must be in a cheery mood."
Or sarcastically:
"Hearing about that suicide was definitely cheery."
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