Lake Superior temperatures this year compared to long term average.

The coldest of the Great Lakes may be headed toward record warmth.

Lake Superior is already the warmest it’s been at this time of year in at least a century, according to Climate Central,a group that researches and reports on climate.

The group recently reported that Lake Superior began warming earlier than normal because of scant lake ice cover and an unusual March heat wave. Warm temperatures since have kept the heat on.

The analysis is based on data from researchers at the Great Lakes Environmental Research Laboratory and the University of Minnesota-Duluth.

The record all-time daily average high temperature of 71 degrees for Lake Superior may be broken in mid-August, according to Climate Central.