Afternoon temperatures during the first week of January have been declining in the US for a century, and have dropped more than ten degrees during the last decade.
The percentage of nights below 20 and 10F were highest on record this year.
But January wasn’t always cold like this in the US. During January 1790, Philadelphia was having temperatures over 70 degrees.
via The Deplorable Climate Science Blog
January 11, 2018 at 11:34AM
Iowa Climate Science Education 
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