Wisconsin summers are quite hot, though I recall hearing that Milwaukee was "90 degrees in the shade", which astonished me, so I guess Green Bay was not quite that hot.
We had no air conditioning, and few fans. The open window was simply open. Still warm air outside and in. At night the sheets would stick to my skin as I turned over trying to go back to sleep.
In the daytimes, I would walk to The Corner Store, aka Boulanger's, to buy popsicles, which at that time were sold in thin paper wrappers. There were two popsicles inside, joined by a thinner area of popsicle that broke easily into two, the second to be shared or stored for later. The flavors were varied: I recall chocolate, blueberry, banana, orange, cherry, grape, lime, and root beer. I prefered lime. Of course, there were also Creamsicles, which were not pleasing to my palate, but would do in a pinch.