Snowy - twice. First when I was in my 20's and living in East Boston - so close to the Bird Flats where snowy owls are sometimes found. It was during the day, shortly after my wonderful Nono died. It was on a bare tree in my backyard and I was on the 2nd floor looking out at it. It flew right towards me looking at me the entire time and then flew up and out of my sight. I always felt my Nono sent it to me.
Second time was on a wildlife cruise in winter out of Boston Harbor. We saw one on the rocks right near a runway at Logan Airport.
I also saw a Barred Owl in the woods in Townsend Mass while hiking with my husband and dog during the day. We saw it up in the trees.
Finally, I saw one near where I live now - again a Barred - in the trees near my house during the day. Of course, I hear them at night. Recently two Great Horned Owls talking to each other across the field behind my house.