oh winters are easy here - I wouldn't want to live where they aren't. "snow" here is usually 1 to maybe 4 inches when it happens at all and then no more than twice in a season. And snow never lingers more than 48 hours or so, if that. I hung the door to swing inward on a downhill slope and it is set about 1 1/2 inches off the ground to start with - clearing a 2x4 sill.We normally get a lot of snow here and drifting is always an issue. I always have the run doors open out. If snow is blocking the door, I can shovel to open it from the outside. I can't shovel snow inside the run, until I can get the door open.
For only a few inches of snow, you can force a door inward. For a big drift from a bad storm or blizzard, you're talking feet, not inches. So, it really depends on what your winters are like.