Not so Dec 2010 was a classic example as was Feb 47 where a Greenland high will bring very mild south easterly Atlantic winds across eastern Canada..both months were extremely cold across western Europe and extremely mild across eastern Canada..also those charts would if the High pressure is where you show it produce extremely cold conditions across Europe Scandinavia and Russia but they show no such anomaly..so to me its shows a continental high across central Europe forcing warm winds over the top of Scandinavia into northern Russia and the arctic..hence the dark oranges and reds in those areas.