I've mainly played AZ golf in the winter, but I played in Scottsdale one day when it hit 100 (topped at 103 I think) and it was better than 85 and humid in New England. It was odd to drink a over a gallon of water and not pee.
I was out there one week for work not vacation) where it was 110-115 and that was horrible. Had to take the towels from the hotel so I could use them to hold the rental car steering wheel. You need to be indoors by 10am on those days. Just happy I live in New England so I can avoid the extremes and just have about 2 random weeks of good weather.