I looked for several runs with cfs meteo and even of course it is way to long it seems to be in every run, that in a few wekks the hole arctic has really low temperatures and if you compare this whis the last years, maybe the pattern like mentioned.
Here is one example.
ATM we have this and we are allready below the average winter temperature the last year, way below, it seems like it get a bit warmer the next week, but like i said i dont look for one run, i detected this cold pattern in nearly every run, first it gets a bit warmer but then often times long periods of time with the darkes coller.
The latest picture is really cold.
The european side seems to have bigger chances to see high temperatures, like here not so far.
Look at germany, this is a seldom cold weather in gerneral but even more true for Dezember.