You might want to start by looking at a phase diagram for water (see picture 2 and simply look at the colors http://www.lsbu.ac.uk/water/phase.html
). It's pretty clear to see that such a process could only occur below about 0 degrees celsius. Right along the borders of the colored regions in that picture represent points where an equilibrium has been established between two different (or three different) states of matter. I hope I didn't mention something you already knew.