As far as long range forecasting goes, this is probably the most data I have seen supporting a favored atmospheric state 1+ month out. The Euro weeklies, ECMWF seasonal forecasting model, and other seasonal models all have a big +PNA (N. Pacific 500mb low) developing and sustaining for the month of February.
For the last few decades, ENSO has correlated to the Global pattern, of all months of the year, the most in February. In La Nina's, we have seen a lot of -PNA's, and El Ninos, +PNA's d