Not much cold air around to finish the year in the Northern Hemisphere: the 850mb area of the -5°C cold pool is the lowest on record.
— World Climate Service (@WorldClimateSvc) December 31, 2023
Highest on record for the date was in 1984, a few weeks ahead of the enormous Jan 1985 U.S. cold outbreak.
ERA5 data since 1950. pic.twitter.com/7BDwEBEz3W