Marianna and Erik left our rented house about 5:30 in order to beat the rush at Epinephrine. When they got to the base about 7AM, there were 6 groups ahead of them. So they did a little 10c called "Prince of Darkness." As you can see, they were cold the whole time. This was on an 80 degree Vegas day. I used my jacket on all the climbs we did unless I was in the direct sun. Waiting at the belays with the wind, was chilly. The temps were high 70s to 80s every day.
BTW, they used a 7mm haul line as their 2nd rope for several 2 rope rappels. Here's the system they used. They thought it worked well - the skinny rope was a lot lighter and smaller to carry. The only drawback was the skinny rope is easier to tangle.