I think for most people, unofficial "summer" is from Memorial Day weekend until Labor Day weekend.
Well, if you like summer, I've got good news for you.Memorial Day, observed on the last Monday of May, is as early as it ever can be, May 25. (Note: that means that there is a Sunday in May after Memorial Day, May 31.) AND, Labor Day, the first Monday in September, is as late as it ever can be, September 7.
That means that there are 15 plus weeks of "summer" to enjoy. So get out there and enjoy it. And hopefully, we'll get some warm weather up here in Duluth to go along with it. :)