What I've noticed about this Summer, there is a lot of cloud cover - that has and hasn't helped our Summer, some little cloud - lots of sunshine, hot night - next day really muggy cloud = which lead to that 33.4*C or whatever it was, which kept the temperatures where they where.
A good summer, I believe is generally less moist - lots of dry heat, no cloud = the Summer 2003 heatwave. Our summers seem too moist to be summers, rather than what we had years and years ago.
I am a fan of Global Cooling and Climate Change, but not a fan of 'Man-made Global warming' - as science suggests that a a lot of dinosaurs pooped and created as much global warming as us humans, the last time earth had issues.