The forecast for Tuesday isn't that bad:
Snow 15?X/7?X. (Today is 1?X/-17?X! and that is before the wind chill)
Trust me, I was born and raised in CA so I am not a fan of winter. Now I am a first yr at UVM and I think 15?X is sweltering. You really do adjust.
As for the technical aspects of surviving in cold weather on interview day: If it is snowing and gross out, bring your nice shoes and change into them when you get to school. And wear a warm jacket!! You stash it in the admissions office and no one will ever see it, so it doesn't have to be fancy.
Don't stress. Interviews at UVM are notoriously chill. And the students rock. Let me know if you need any advice.