More Musical Mystery Mayhem

I can find a few references to the lyrics of "It's Going to be a Long Summer," but little else - not a performance or anything about the origins.  So I am asking for your help - anyone know much about the song that goes through the four seasons and starts like this?

It's going to be a long summer
and what will the birdies do then, the poor things
They'll fly to the pool to keep themselves cool
and tuck their heads under their wings.