And snow ‘falls’ in gravity. This aggregated somehow else.maybe by tenuous electrostatic attraction (some ice particles get positively ionized when a photo kicks out an electron, some get negatively ionized when an electron attaches to them, & cetera and eventually they clump together to make a roughly electrical neutral object. The. Hydrogen bonds kick in once it’s electrically neutral (assuming it’s made of water or other polar molecules).

But a pile of snow is not.