Dunno how exactly this will come in handy quite yet. But found it interesting...too close to be a coincidence.
Weber kettle when cooking offset is almost exactly 100 degrees different from hot to cool side.
After it cooled down a bit...cool side
Then over to the hot side
Opened up the cleaner and did it again. Hot side
At any temp range, the greatest difference on the surface temp thermo was no more than 2 degrees away from a 100 degree difference