NOTICE 07/25/18
Sea Ice Index
- Arctic
- Antarctic
- Monthly
- Daily
The monthly Sea Ice Index provides a quick look at Arctic-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.
Monthly Sea Ice Extent Anomaly Graph
![](https://webarchive.library.unt.edu/web/20201218033821im_/https://nsidc.org/data/seaice_index/images/n_plot_hires.png)
The daily Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. It provides consistently processed daily ice extent and concentration images and data since 1979. Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on a 30-year (1981-2010) median (orange line).
Daily Sea Ice Extent Time Series
![](https://webarchive.library.unt.edu/web/20201218033821im_/https://nsidc.org/data/seaice_index/images/daily_images/N_stddev_timeseries.png)
The monthly Sea Ice Index provides a quick look at 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.
Monthly Sea Ice Extent Anomaly Graph
![](https://webarchive.library.unt.edu/web/20201218033821im_/https://nsidc.org/data/seaice_index/images/s_plot_hires.png)
The daily Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice. It provides consistently processed daily ice extent and concentration images and data since 1979. Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on a 30-year (1981-2010) median (orange line).
Daily Sea Ice Extent Time Series
![](https://webarchive.library.unt.edu/web/20201218033821im_/https://nsidc.org/data/seaice_index/images/daily_images/S_stddev_timeseries.png)