if you take a thermometer out there on a sunny day, first day of summer, noon, the temp is 130.
no metal involved, put it on a wood railing on your deck. 130. I've broken 1 thermometer doing that.
130 is a sunny day, in the sun. so, it definitely could be 140 on a metal roof, but a 140 degree roof ain't so bad if 130 is normal if sunny.