There are many factors to consider, some that are not critical such a wind ,cold weather, pigmentation.
The one to be concerned with is fever do to an illness. Have you pulled a temp on any of the calves ?
Maybe ,maybe not. If you have not had to treat any for symptoms such as pneumonia and severe scours then it is probably weather related .. BUT if you have I would look into it further, pull a couple of temps and see what you get..
It is usually an indication that the animal had a fever a few days ago. Usually by the time they are peeling, you have either treated them, or they are over whatever caused the fever. Chances are that the animals whose noses are peeling won't have a fever now. Or, possibly photosensitivity, although if that is the problem, they should be peeling anywhere there is white markings.
The other option could be sun or wind burn, but I can't say that I have ever noticed much of that.