Why does it snow?

So this weekend I was upset at nature for pouring down frozen white stuff in March, so I put as my facebook status the philosophical musing "Why is it snowing?"

Luckily, the brilliant Dr. Asplund reminded me that I should already know why:

"Because the temperature is low enough that the enthalpic drive to form strong hydrogen bonds is winning out over the entropic drive to create a non-crystaline water droplets. Have you learned nothing in P-Chem?"

Thanks Dr. Asplund! Since I didn't get on facebook again until it was sunny, I was amused at and not bitter about that answer.