I'm obviously just bull****ting. I have worked in 110*+ and it's not very fun. Especially if it comes on early in the year when you're not used to to heat yet.
Walnut dryers are 110* and 100% humidity when running

luckily I didn't have to work inside them much.
The hottest I've ever been was running conduit in a metal barn. 108* outside and my head was ~8" from the roof. No airflow and the roof would burn you if you toughed it. Had to be ~130*. It was so hot I forgot why I was up there the first couple times I went up

I'd go up and work for about 5 Mins before I had to go down and drink water and remember what I was doing. 108* on the ground felt nice and cool.
I've only just had to work in actual cold this last winter and there is quite the learning curve dealing with frozen ****. My buddy made this mistake of leaving his skid steer tracks all packed with mud on the last above freezing day

took 30+ Mins to get the thing to move.
I can't fathom near 100* and rain. 75* and rain feels super odd to me.