I just heard a Christmas song in July, "Candy Cane Sugary Plum" as recorded by Danny & the Juniors.
It's a cheerful little thing with some Chipmunks effects in the mix, and singing in rounds to boot. I don't know that I'll make it part of my normal holiday playlist, but could be.
For a hot day in July, though, it sounded good ... and out of place.