by Hikin_Jim » Mon Apr 28, 2008 4:33 pm
You're probably fairly on target with thinking that temps above 6000' will be better, but the heat is perhaps just a tad more than "unpleasant." Maybe a better term than "unpleasant" for the temperatures on this route would be "hellish." Seriously. If you haven't done desert hiking in 100+F weather, you just might not have a feel for temperatures like the ones on this route.
It gets really hot really quickly. You're often in direct sun. The air is extremely dry and sucks the moisture right out of you. There is no water en route. You're climbing a steep, difficult route that really isn't a trail. Hot + intense sun + dry air + waterless + heavy exertion = perfect conditions for heat stroke or, potentially, even a fatality. Even in April, things can be really hot, as it was this past weekend. On today's date last year, the high was 106F (per The Desert Sun newspaper).
When it's really hot, 2:00 AM - 3:00 AM is typically the coolest point of the day. People start then and try to get as high as possible before the merciless sun beats down on them.
By the way, you'll frequently see different start times in cooler weather.