Fig. 1: Eastern US, Northern Europe, and East Asia all share cold temperatures during the negative polarity of the NAO.
From: No detectable trend in mid-latitude cold extremes during the recent period of Arctic amplification
Northern Hemisphere December–February (DJF) surface temperatures are regressed onto the NAO index shown for the negative polarity. Also shown are the five regions of analysis: the Arctic and four mid-latitude regions, Central and Eastern US (CEUS), Southern Siberia and Northern China (SSNC), Northern Europe (NEUR), and Southern Europe (SEUR).
