Year-To-Date Average Sea Ice Extent

The average for the year for Arctic sea ice extent is only 6th lowest per March 14th. These are however still early days, and a 73–day average, while much more reliable than just a daily figure, is a lot less indicative of where the year is going than, say, a 100–day or 200–day average. This could still go either way!

Q: Where’s the data source for this plot?
A: Here: https://ads.nipr.ac.jp/vishop/#/extent
Q: How can anyone make a year-to-date average graph?
A: Easy. Use a computer. Add all the ice for every day so far this year, divide by the number of days.
Q: Why would I even do that?
A: Let’s say you want to know how much ice we have in 2019 compared to other years.