It becomes official when the slip n slide comes out of hibernation. Its summertime.
The kids were entertained for a full hour on Saturday afternoon with the slip n slide while I did the chores around the Frick Farm (currently we're at 14 chickens, 6 ducks (they'll go to Grandma's pond again), 2 dogs, and a cat).
They came to me several times with teeth chattering and shivering because the water is cold, but they'd be right back at it.
Its officially summertime...and I'm not sure who is happier, them or me.