That's what has really been screwing with models looking in the medium-to-long range...the MJO has been on the active side and given the models struggle with the MJO it's yielded extremely uncertainty moving forward. Even short-term...there is uncertainty with how the MJO behaves before its signals weakens.
Anyways...I think things are looking rather volatile moving towards the end of the month into February. I don't see any signals to lock-in cold for a pro-longed period...but this is something which I think is a bit overrated...especially given we're moving through the meat of climo.
One signal which remains strong is how the Pacific looks to evolve with a very strong signal for a major EPO ridge to build across the NPAC. Would it be nice for the NAO/AO to be negative too...absolutely, but what I think to look for would be periods where they are "less positive" or becoming "less positive"...this signal can yield a brief influx of a colder airmas and then you just take your chances with timing with any storms...in which the pattern should be active.