Because there really is no surface, at the edge of the event horizon, an object would need to move at the speed of light just to maintain a stable orbit. So most of that temperature/heat/energy/radiation/light is going to get pulled below the event horizon and never be able to affect anything outside the black hole.

Another way of thinking about it is the "high temperature" you would expect to be on the surface has been concentrated in the singularity in the center of the black hole, which is not necessarily a place in space but a place in time, because beneath the event horizon space and time, for all intents and purposes, have switched places.