I was in DL Aug 6 and it was cooler than normal! I was in DL in march and that was warmer than it was the day in august!
But it was nice since my family hates the heat, so no complainers! I think the highest it got was about 74. I happen to enjoy the heat so I was a bit disappointed but who cares, I was in DL!
I am going back in mid-October, hoping for nice weather then too.