Not a very elegant image, perhaps, but it gets the point across.
Record cold temperatures
When looking at the image below, the states cross-hatched in blue broke or tied records for either coldest high or low temperatures observed on Nov. 11-13, 2019.
“According to the National Weather Service reports, nearly the entire eastern half of the United States tied or broke records due to the arctic blast.” Looks like two thirds of the continental US (lower 48) to me.
The Midwestern Regional Climate Center reported that more than 850 daily records were broken across the Midwest in just two days.
We’re talking about records that go back for more than a century.
But when I look at the huge number of states involved, I find that hard number to believe.
How many cities and towns and villages are we taking about here? How many weather stations? I’m guessing we’re looking at thousands broken daily records.
See lots more: (Of course this article calls it an ‘unseasonable cold snap’.)