Prior to 1965, October 18 was a very warm day in the US, but after 1965 temperatures plummeted and never recovered.
On this date in 1953, almost the entire US east of the Rocky Mountains was over 80F, and much of the southern US was over 90 degrees.
via The Deplorable Climate Science Blog
October 18, 2017 at 01:39AM
Iowa Climate Science Education 