I will piggyback and say that most moderate La Nina's tend to have variable Decembers where as Jan/Feb tend to be money for the region. If there is something in those Decembers it is usually the last week of December. I know that people are getting antsy but I'd like to point out for example 10-11 DTW had 9.2" in December and ended with 69"+ and that December NYC got crushed with the Boxing Day storm and heavy snow in January but they were largely done by Feb 1st, where as most of this region saw most of their snow that month.