Monthly Arctic and Antarctic Sea Ice Data
National Snow and Ice Data Center
The monthly Sea Ice Index provides a quick look at Arctic- and Antarctic-wide changes in sea ice. It is a source for consistently processed ice extent and concentration images and data values since 1979. Monthly images show sea ice extent with an outline of the 30-year (1981-2010) median extent for that month (magenta line). Other monthly images show sea ice concentration and anomalies and trends in concentration.
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