Yesterday it was 86 at 5:30 when I got to the lake bed to fly. It was slated to hit 112 by early evening, I didn't look but I don't think it made it that high. Keep in mind there is no real humidity here to speak of so it never feels as hot as it can get. We park our vans due east and just open up the lids and set up our chairs in the shade, move as the sun moves. Some of the guys have shade tents they hook up to the back of there trucks or vans. My van always has a 6 pack of water in it. I keep a case of water in the freezer and put three frozen bottles in my open top cooler so it melts, never melts all the way so I just keep adding water as I go.
As for the planes, the heat doesn't bother them at all until the weather starts cooling down come late fall. When you tune them for 100 degrees and it drops into the 60s things start changing so we have to fatten up the high ends until it gets into the 30s and 40s, comes to about 4 clicks.
Today a storm is blowing through and it's warm and overcast. Humidity is up to 17% and for us that a case of the mug. I like the heat but can't stand the humidity so this is a great place for me.