I don't know if the assertion you made is true, ie that an omniscient entity can't explain everything there is to know about temperature by looking at the simple movement of atoms. What's the basis for this? I know you followed that up with a rationale, but I didn't really follow. Just because this abstraction (temperature) allows us to come to conclusions and inferences about state and state changes doesn't mean that there's anything real about the abstraction aside from the cognitive structure in our brains that helps us to process the world around us effectively.