More facts that won't really matter (cooling boreal winters)

That the boreal winters have been cooling is pretty much a known fact among researchers.  The reason for this is currently anything but settled science.  These papers show why it's a fact.

Observed and simulated temperature extremes during the recent warming hiatus
Complete paper here (full paper pdf)

Trends in hemispheric warm and cold anomalies (full paper pdf)

Recent Arctic amplification and extreme mid-latitude weather (full paper pdf)

Arctic warming, increasing snow cover and widespread boreal winter cooling (full paper pdf)

Decadal Fluctuations in Planetary Wave Forcing Modulate Global Warming in Late Boreal Winter

Full paper PDF

Improved Skill of Northern Hemisphere Winter Surface Temperature Predictions Based on Land–Atmosphere Fall Anomalies

Full paper PDF

This paper may explain why it's happening.
Shortwave and longwave radiative contributions to global warming under increasing CO2 (full paper pdf)

The short version is this. CO2 trapping of infrared radiation is not the ultimate cause of global warming. (this is in the paper)

It's the feedbacks from the initial warming (from CO2) that models show will cause the expected warming. These feedbacks result in short wave (visible light) causing the expected warming, as there is less snow, ice and sea ice reflecting it back into space.

If this study is correct, then it could explain why the boreal winters have been cooling.  Because instead of less snow and ice, there has been more, leading to that drastic January and February cooling trend.