NSIDC sea ice concentrations
X axis: whole world in 360 1.00° steps, first point at 44.50° W, last point at 314.50° E
Y axis: regular grid with 45 1.00° steps, first point at 45.50° N, last point at 89.50° N

Monthly data available from Oct1978 to Apr2013 ( 415 months)
Variable ice (sea ice concentration) in 1

Get grid points, average area or generate subset

Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average set of grid points subset of the field
Demand at least:	% valid points in this region

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) seasonal monthly 10-daily 5-daily daily
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of ice concentration
Threshold:	no cut less than greater than 1 percentile normal 1971-2000
Minimum:	% valid data

getfieldtype: please ask me to add "ice" to the lists in getfieldtype

Construct a statistical forecast model from this field

Please consider downloading this field from the authoritative site.

If you really want to get it here, NSIDC ice concentration is available as GrADS .ctl and gzipped .dat files (size 25.6462 MB)
Alternatively, you can generate a gzipped netCDF file of the same size.