National Snow and Ice Data Center
Sea Ice Index
The monthly Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. It is a source for consistent ice extent and concentration images and data values from 1978 to the present. Monthly images show sea ice extent with an outline of the median extent for that month (magenta line). Other monthly images show sea ice concentration and anomalies and trends in concentration.
Data and Resources
Start Date: 1978/01/01
Data Types: Image, Database