Not seeming warm +3 C sst near New Siberian Islands has some localized impact . Remember local average temperatures for the 2 guys living on Kotelny (the largest) Island is -11 C in October. No doubt the once much warmed East Siberian sea is still giving off some heat.
We look at New Siberian Island Novaya Sibir to the upper right on September 27 covered with snow, nothing unusual, however lost most of its new snow on October 2. To the left is pack ice moving towards this Island:
Oct 4 2007, a clearer view, to date, Oct 4 2018 same Island is snowless.
Meanwhile since Minimum date, North Atlantic Front is nearing 85 North. JAXA September 23 October 3 2018.