On Saturday, 17 September 2016 10:42:41 UTC+1, JohnD wrote:
Isn't the explanation there in black and white on the NSIDC site, ie:

'NSIDC produces the daily extent image and graph using a five-day trailing
mean. Please note, the values provided are the individual daily values, not
the five-day average values that NSIDC displays for its daily extent image
and graph'

All you have to do is to click the 'About the data' link.



Why do you have to ruin everything.