I'm not sure where that Snowbird data is coming from. I don't think 1994 and 1999 were quite as low as this year. But when you're at ~60% of normal snowfall on January 7 it's going to take a spectacular back end of the season to get to 100%. Rather than look at what happened in a couple of low seasons, I would suggest looking at the whole dataset of January and later snowfall and see how many of them had at least (season average - Nov/Dec 2011). Alta's average is 534 inches, Nov/Dec 2011 was 96, so it needs 438 after Jan. 1 to reach average. 6 out of 43 seasons had that much snow after Jan. 1.
Fortunately LCC does not need an average season to have quality skiing. 2006-07 had 71% of normal snow and still had 15 "A" weeks and another 11 "B"s by my scale. That's about equal to an average season at Mammoth or Whistler and well above average for anyplace in Colorado.
Season length: 21 months, Nov. 29, 2010 - July 2, 2012
Days in one year: 80 from Nov. 29, 2010 - Nov. 17, 2011
Season vertical: 1,318K in 2010-11
Season powder: 291K in 2011-12