I agree he doesn't love the heat, either, and that he's very happy indoors. He prefers the controllable conditions. Though, he's obviously managed a lot of winning even outside of his comfort zone. I just had to challenge Front on calling him a great wind player.
Rafa's spin is a huge factor. He can usually keep the ball in court by making it heavier than the wind. Also, his ability to focus in adverse conditions. Of the 3, he was the one who favored outdoors.
Interesting sidebar on wind players: Murray learned to play in the wind. (He was such an intelligent player, IMO.) In 2009, he played a final at IW v. Rafa in a terrible desert windstorm. Rafa beat him soundly, 1 and 2. Cut to 2012 US Open SFs, with a hurricane not far from NYC and the wind was terrible. Murray beat Berdych in the first SF, by outsmarting him in the wind. (Berdych has a high ball toss, which was a liability in the conditions, but Murray's assessment of what to do, depending on which side of the court, was masterful, as he detailed after the match.) Djokovic, in his SF, was losing in the first 2-5 to Ferrer (!!) when play was stopped, and Djokovic turned it around the next day, when conditions were much better. But in the final, wind was a factor, and helped Murray to his first Major win. Djokovic, for all of his talents, can't seem to adjust to the wind, in the same way. I don't think Roger ever did, either, though he rarely got as crabby about it. LOL!