While some organizations (such as @NWS) will soon shift their 30-year climatologies to 1991 to 2020, we plan to maintain the 1981 to 2010 period as our standard climatology for our Arctic Sea Ice News & Analysis posts. Learn why: https://t.co/nS5v9qMVps

— National Snow and Ice Data Center (@NSIDC) March 12, 2021