30 year weather data useless

The National  Snow and Ice Data Center is changing the way they display Arctic Ice information graphically.   For years they have used the period from 1979 to 2000 as a base data set.  They are increasing the period to 30 years ….as the site states:

Until now, we have used the 22-year period 1979 to 2000 when comparing current sea ice extent to past conditions. When NSIDC first began to monitor and analyze sea ice extent, a longer period was not available. Since the satellite record is now extended, we are choosing to move to a more standard 30-year reference period, from 1981 to 2010.

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