In Fahrenheit I run mine about 100.7 and when it went up to 102 none of my eggs hatched so I would say that 2 degrees cooked them. I have had them to drop to 98 and still be good to go but it took a bit longer. Hotter will definitely kill them but I would say it depends on your set up, too.
102 wont do it. It takes 103 inside the egg for an extended period of time. So that would take air temp of 103 or 104 for hours or 120 for minutes.
