Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center:
Volume increases for December in the last 10 years aren't all that far apart, ranging from 3500 to 4000 km3 (rounded off). This year was on the lower side of that range, with 3547 km3. Only 2010 and 2014 were lower than that, just barely. This means that 2017 ends the year in third spot. The gap with 2012 has been reduced some more, from 733 to 497 km3, and the quickly widening gap with 2016 has stopped widening for now, going from 1482 to 1340 km3.
Here's how the differences with previous years have evolved from last month:
On Wipneus' version of the PIOMAS graph you can see how that difference with 2012 has become smaller again since September (red is 2017, purple is 2012):