At the end of October 2020 we had record cold here in Cheyenne, with our maximum temperature reaching on 11F on October 25, 2020.
Wyoming has had 1,698 October daily maximum temperature readings below freezing since 1895, but they were much less common and much less cold from 1937 to 1968. Two of the coldest October cold waves occurred in 2019 and 2020.
October 26, 2020 was the coldest October 26 on record in the US. The warmest was October 26, 1927.