I think this happened in the winter of 1966-67, unless my memory was also frigid.
There were days when we were allowed to wear just about anything we could to keep warm. During this cold snap there came a measurable snowfall, one or two inches I think.
That evening when General Futch was making rounds someone almost hit him with a snowball, so the next day (a Saturday) he assembled us all and separated us into two groups and we had a one charge snowball fight.