2018 was the 2nd lowest calendar year on record for annual average sea ice extent in the Arctic. After 2016, but before 2017.
Q: Where’s the data source for this plot?
A: Here: https://ads.nipr.ac.jp/vishop/#/extent
Q: How can anyone make an annual average graph?
A: Easy. Use a computer. Add all the ice for the latest 365 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 2018 compared to other years.