From Maxar, October recap:
“October Recap: Cold Rockies / Warm South
October 2019 featured widespread and significant cold from much of the West to the Plains and significant warmth in the South and East. The net result yields 283.8 GWHDDs, between the 10-year (259.2) and 30-year (289.7) normals. The early-month heat in the South/East along with late-month Santa Ana heat in SoCal drove a total of 84.9 PWCDDs, ranking 5th-highest since 1950. 368.7 total degree days (TDD) ranks 18th-highest since 1950. October ranked 4th-coldest on record in Denver, 2nd in Salt Lake City, 3rd in Portland, and coldest for some stations in Montana, while ranking 5th-warmest in Atlanta, 7th in Washington DC and Richmond, and warmest for some stations in Florida. The beginning of the month was exceptionally hot in the Mid-Atlantic and South, including monthly records set in DC (98° 10/2), New York (95° 10/2), Atlanta (98° 10/3), and Memphis (98° 10/3) among many others. The West was marked by cold and early season snow, peaking with an impressive cold blast earlier this week. Salt Lake City set a monthly record low (14°) on Wednesday while Denver tied a monthly record cold high (18°) on Tuesday. October marked a significant change in the precip pattern, as areas of the East and South that saw very little rain in September received significant rain this month. Snow was plentiful in the Rockies, and Chicago had its 2nd-snowiest October on record with 4.6”.”