Umpired tonight, solo game, 18u rec league with a 2 hour time limit. The strange thing was that despite the 101 degree temps this wasn't even in the top ten for the most miserably hot games I've ever worked.
Humidity was only about 35% and there was a steady breeze- that made it bearable.
The all-time worst was probably in Zanesville at the Jamborie last year! Mid-90's with humidity to match, heat index over 105, and we were out there all day long. Absolutely miserable. Had one umpire disappear in the middle of the game- found him puking in a port-a-potty.