This. I understand there is no scientific correlation, but it "seems" whenever we hit a string of 90's in April, the following summers are tolerable (1976, 2009).
I wouldn't call this a "cool" summer (speaking strictly imby), I would call it seasonably warm. Uncomfortable too with the high dews. Plus I've only been under one heat advisory so far (unlike our "hot" summers where we can go a week or more under excessive heat warnings).