That's an interesting point. When I look at the soundings in the regions depicted as sleet on the maps, I see the only violation of 0c is the narrow nose right at 700mb. In reality, I wonder if it is sleet mixed with snow that forms below 700mb?
Saturday record low maxes possible. Can you imagine NYC with a high of 6f? I wonder what it was in SLK that day.
Record Low Maximum Temperatures:
January 24:
KEWR: 15/1936
KBDR: 20/2014
KNYC: 6/1882
KLGA: 18/1987
KJFK: 19/1987
KISP: 19/2014