I have a small(ish) - about 12ft x 12ft concrete pad on the back of the house covered by the house's roof with 2 walls exposed. The concrete pad appears to be solid - no major cracks, flat and level.
Dad and I just finished laying ceramic tile for my brother in a sun room on a concrete pad also - we used a blue tile membrane (tile store recommended it) and it worked out really well - easy to use, cut, install and the tile feels nice and solid.
Using this same material and installing my porcelain tile on it; preparing the surface properly (scraping, cleaning with power washer, etc...) is there any reason I can't or shouldn't install tile outside in a state where it can snow pretty significantly in the winter? In Buffalo, NY, so we can expect 1 foot of snow or 12 any given season. Even when it snows, the roof keeps most of the pad pretty clean.
The purpose is just to dress up the space. I built a brick pizza oven on this pad years ago; have this tile left over so... why not use it.