To date, this June has seen one the lowest total decreases on the record, as shown in this graphic:
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As it stands, more than twice as much ice had been lost by this date in June of 2012 than has been lost so far this month.
Twice as much extent, sure.
Twice as much ice? (i.e. actual volume). Doubtful, I'd say...
... and there's not very much left to lose. So it's not about how much has been lost, as how much there is to go.
I have said on this forum many times over the past three years that If the ice is uniform in thickness, most of the extent will go all at once. From what I've seen so far, this year is still a candidate for the big crash.
There is no doubt that because of the low maximum there has been much less thin ice this year.
Measured by extent this year has had about 25% less of thin ice compared to 2012 and about 15% less than 2010 and 2012. In the range 0.6 - 1.1 mtr thick, according to Chris Reynolds PIOMAS April distribution, 2015 had only 1.25 M km^2 compared to about 1.96 in 2010 and 2012. This is the ice that usually melts out in early June and indeed it has all now gone.
Even allowing for this 2015, has been slow over the past three weeks and it will be interesting to see if it starts to move again soon.
Jumping on David and others bandwagon - low max is part of the cause here, as a LOT of ice did not form in peripheral regions that contribute heavily to June melt.
Considering the higher 2015 Hudson, Baffin and Kara extent vis-a-vis some years, we are a lot closer to 2007, 2011 and 2012 than numbers otherwise might suggest.
Further, there is ice in some areas - specifically the ESS and Laptev - which at the end of the refreeze due to winter export was left thin and weak. If you look at the Siberian coast thread, this exactly the ice getting clobbered right NOW in a big way. The disintegration of that extent, en masse will contribute significantly to Julys numbers and likely catch 2015 up with the lowest three years.