Here's a chart of Denver's journey from its first September 100° on record (9/2) to its coldest October high on record (18° yesterday). It's almost as if a switch was flipped on October 1! #cowx #denwx #FromSeptorchberToOctobrrrrrr pic.twitter.com/TN08c5aJvS

— Maxar | WeatherDesk (@Maxar_Weather) October 30, 2019