In Siberia, this is nothing

as was spoken by a Russian gangster in The Sopranos when two of Tony's cronies complained about the bitterly cold weather as they made him dig his grave.  In the USA, there is much talk of a polar vortex enveloping the country as if it is The Day After Tomorrow.  Temperatures falling as low as -38.3 degrees Celsius in Minnesota, while in Pennsylvania temperatures are falling as low as -26 Celsius compounded by a wind chill factor that could make it -39 Celsius.  It is so low that the figures for Celsius and Fahrenheit are virtually identical.
In Mongolia, however, they endure regularly such temperatures and once every few years it falls to -55 degrees Celsius.  Both Mongolia and much of the USA are at the centre of continents so there will be a dryness of the climate factor ameliorating the freeze.  What the USA is suffering is sunbathing weather for Mongolians, not least because even in the depths of winter, Mongolia is not known as the Land of Blue Sky for nothing.  If anything, the 30 degree differential in relatively coastal Newtown, Massachusetts is the big story going from 16 degrees to minus 14 in one day.