2020 has currently broken the all-time largest sea ice extent |anomaly| on record ---> more than 3,200,000 km² below average.

Graph uses 1981-2010 climatology from NSIDC data (5-day running mean). Although there are small data set nuances, this is a historically bad freeze-up! pic.twitter.com/qLl6PxqoPB

— Zack Labe (@ZLabe) October 19, 2020