If summer is a shelf of books ...

Memorial and Labor Day are its book ends.

Why?  Up on the continent, the end of summer and Labor Day go hand in hand.  Not that you need go immediately from a swim suit to wearing a scarf from one day to the next, but its pretty close -- if not like clockwork.  Labor Day definitely favors on the summer side of the divide, serving as its de facto "last hurrah."  Then there's the case of Memorial Day down in south Florida.  Just as Labor Day may usher in a freshet of cooler and crisper air Up North, Memorial Day typically is the tropical (not polar) opposite: greeting south Floridians with a chinook of humid air at their door, suddenly giving urgency to the old expression -- "Close the door you're letting the air out!" -- and leaving one to wonder if per chance he or she didn't mistakenly put on a heavy down sweater instead of a T-Shirt.  Yes, it's that warm and humid.  There's another saying in Florida: "It's not the heat, it's the humidity."  Between Memorial Day and a solid six weeks after Labor Day, the expression especially applies.  

Find out more at Go Hydrology (https://gohydrology.org)