Including 2020, the linear rate of decline for January ice extent is 3.15 percent per decade. This corresponds to a trend of 45,400 square kilometers (17,500 square miles) per year, which is roughly twice the size of the state of New Hampshire. Over the 42-year satellite record, the Arctic has lost about 1.86 million square kilometers (718,000 square miles) of ice in January, based on the difference in linear trend values in 2020 and 1979. This is an area larger than the state of Alaska.
Keep in mind this is sea ice extent, as opposed to the sea ice volume I discussed in my previous post.