Arctic Sea Ice Volume already lower than 1979 Sep 20

Yesterday daily Arctic sea ice volume was already lower than on September 20th, 1979, with almost 100 melt days to go to that date. 2019 Melt Season average is 2nd lowest. Ten–Year Trend though, is still very stubborn.

Q: Where’s the data source for this plot?
A: Here: http://psc.apl.uw.edu/research/projects/arctic-sea-ice-volume-anomaly/data/
Q: How can anyone make a decadal average graph?
A: Easy. Use a computer. Add all the ice for the latest 3650 days, divide by that number of days.
Q: Why would I even do that?
A: Let’s say you want to know how much ice we have in the latest decade compared to the decades before that.