No snow, unfortunately, or I would have my two burnt fingers by stupidly grabbing the exhaust while trying to get further under the car stuck deep in the snow. Stupididy hurtz.
Doh! I missed that clue!
Because what I was going to suggest was to throw a handful of snow on the suspected rotor after a drive and if you have a sticky caliper that handful of snow will go pfffft and immediately steam away. I hope you didn’t touch the actual cat converter. They get hot enough to start a pile of leaves on fire!