Welcome to halloween in Montana.  Just like a clock, when the scary day rolls around in Montana you can count on either rain, snow, wind, or all three.  When my kids were young and ready to go trick or treating, they would dress up in their costumes days in advance to see what they would look like.  My experience was that was actually a good idea.  When it came to the big night, I knew the weather would dictate that they would be wearing coats, boots, and gloves.  The one tradition we had every years was that once we got back to the house, we would sit in a circle on the living room floor.  The kids would empty out the candy and dad got to pick out a few his favorites.  ( I figured it was only fair, since I took them on the excursion in the first place.)