Veeeery cold. But good program (I graduated in 2000). If you like hockey it's a fun place. (Although I hear things have toned down a lot since I started in 96... I guess the students aren't as wild as we used to be).
A good number of good looking girls, but you won't see much of them between October and April since everybody is buried under layers. Of course the plus is there's the positive of using body heat to keep each other warm...
ND is a good place to learn to fly. You'll be able to handle any sort of crosswind after 4 years of flying there, and the summer gets hot and you learn to deal with thunderstorms too...
I can say that there were certainly days when I rolled out of bed at 5am for a 6am flight in the winter when it was minus 20F and the sun doesnt rise till around 8, and I wondered why the hell I didn't go to Daytona (Especially when the kind people at the weather channel would inform me it was 60F there). But, if I had to do it over again, I'd still go to UND...