Thanks for pointing that out and providing transcript, couldn’t believe what I thought my ears were hearing. We do know that fateful Sunday was a solid week into a heatwave which did not relent until the day after the bodies were recovered. That data sounds like from the El Portal station. May well have been hotter in the exposed south-facing Gulch. (But I don’t understand the listed river elevations at 1930’ at base of HCOHV and 1800’ upstream at base of S-L).
The transcript of the sheriff's remarks says: "The temperatures along that section of trail ranged between 107-109 degrees from 12:50pm -2:50pm cooling slightly from 4:50pm to 8:50pm from 105-89 degrees." So it dropped to 89F at 8:50 pm, sunset was at ~8 pm. It wasn't 85F at 5 pm, it was well over 100F.