There is are a lot of theories popping up at YouTube around this..ehm..extreme weather.
I found this one very accurate, in fact its maybe one of the good ones out there http://www.youtube.com/watch?v=K_P-kUrTuj8 (http://www.youtube.com/watch?v=K_P-kUrTuj8)
Last night, here where I live, the east part of Norway in one of the greatest valleys you find in this country, we had at Christmas Eve minus 26 degrees Celsius, and you could sense the cold fresh air from the doors even when they where closed. Around the main door handle, there is a tick layer of frost... When you run outside here where I live, it looks like winter wonderland, typical Norwegian postcard-winter.
And now we are currently reading in mass media about a chaotic weather situation in Denmark. http://www.bbc.co.uk/news/world-europe-12066894 (http://www.bbc.co.uk/news/world-europe-12066894)
It is with no doubt something going on here.. something is about to freak out!