Not snow in the amounts like most of the country gets but it did actually snow during our last trip to WDW in January 1997. Well, it technically was snow but you had to squint pretty hard to see the tiny, tiny flakes -- still was a kick to watch the local news and see everyone freaked out over snow falling in central Florida.
During that trip, temperatures were colder than they had been in over 30 years.
The first half of our trip was normal Florida weather but the second half of the trip gave us evening temperatures in the 30s and night temperatures in the mid-20s and we had not brought our winter coats to WDW. We played miniature golf one night and could hardly stand to be out. Walking around DTD at night was miserable. People were scraping ice off of their car windows in the mornings.
On the last full day we were there (January 24 -- my DW's birthday), three members of the family went to AK, but seven of us stayed mostly indoors (and left one unused day on our Park Hopper tickets). The HIGH daytime temperature was about 36 degrees that day.
http://www.srh.noaa.gov/mlb/surveys/012403/flurries.html
-- Rob