Darkened area on Mount Michael

A darkened area was visible on the summit area of Mount Michael in an image from 3rd April 2015. In images from 22nd March and 2nd April the darkened area was also visible.

I am under the opinion at this point that this could be no more than increased surface temperatures at the crater area. The coastal areas around Saunders Island is also free of snow and ice.

Darkened area at the summit of Mount Michael is visible in this image from 3rd April 2015. SOURCE: NASA.