CNN
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It’s really, really cold again — as the US shivers through at least the eighth blast of air from the Arctic this winter.
Winter, which is warming faster than any other season for much of the US, seems to be making a comeback for the first time in years; this January was the coldest in the Lower 48 since 1988.
But the US is an outlier, and so is this winter. January was the warmest on record for the globe and, in a vast expanse of global warmth, the US sticks out like a cold, sore thumb.
Scientists say it’s being caused by a misbehaving polar vortex combining with a key weather pattern that seems to be stuck in place.
