Rigsby . . Altitude makes a big difference, especially once you're above about 3000' MSL, and the temperature gets much above 85°. The "Air" just goes away . . add in a 5 mph wind and it gets worse.
Years ago there was motorcycle classes for the Pikes Peak Hill Climb, and a couple of times we did that . . Talk about a tuner's nightmare. Start at 9000' and go to 14,000' . . 85° at the bottom and about 55° at the top. Had no idea back then about "Air Density, corrected", but I'd bet there was "NONE" . .
But . . In places where there are dense forests surrounding the race track, altitude reads may show less air, but because of the trees, the oxygen content in the air is greater . . it's a real tuner's conundrum. Seattle, Houston, Memphis, all have this particular situation and while it's not as big a deal to the normally aspirated cars, add a blower with Alky and your exhaust temperature problems seem to multiply, while your weather station is telling you there is no air . . Add Nitro and it gets real edgy.
And Mark's pretty close on the temp thing, I think. We try to keep the water at about 100°, engine oil(pan Temp)@ 115-120° and the converter @ 120-135°, depending upon the time given between rounds . . We try to come into the water at about 160° and it's usually about 170° at the launch . . And the longer you're against the converter the softer the leave . . Just sharing what I think I've learned . .
And we'll be listening on Saturday (Super Chevy) for your wife . . We're the purple 67 Camaro (The Grape Ape) in S/Pro . . If we get a chance we'll stop by and say Hi . .