What satellite sensor provides the data?
You can still visit NSIDC’s Sea Ice Index daily sea ice page for the most recent data. General information on the minimum, from satellite data between 1979 and 2007: Minimum Extent (in millions of square kilometers, 1.00 mill sq km = 1,000,000 sq km) Average minimum (1979-2007) = 6.45 One standard deviation range (1979-2007) = 5.65 to 7.25 Highest minimum (1980) = 7.54 Lowest minimum (2007) = 4.13 Date of Minimum Extent Average date (1979-2007) = 11 September One standard deviation range (1979-2007) = 6 to 14 September Earliest minimum (1987) = 3 September Latest minimum (1979) = 22 September For all of the data and graphs of the extent and date of minimum, see here.