Image caption
Sea ice concentration across the Northern Hemisphere on March 22, 2025, ranged from 15 percent (medium blue) at the margins of the ice pack to 100 percent (solid white) in the heart of the Arctic Ocean. The yellow line shows the location of the median ice extent on March 22. Median means “in the middle,” or halfway between the smallest and largest extents on record. The dark circle over the North Pole signifies a data gap; satellites do not pass directly over the poles. NOAA Climate.gov map, based on data from the National Snow and Ice Data Center.