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Average sea surface temperatures were 4.2 degrees above the long-term averages from before 2012, when ocean 'heat waves' became commonplace, continuing changes in the gulf ecosystem.
Temperatures will average out near normal for this week, with wide swings from the 50s down to the teens, but no accumulating snow is in the extended forecast.
The Gulf of Maine Research Institute in Portland said temperatures reached an average of six degrees warmer in 2021 than ever before.
The Gulf of Maine Research Institute in Portland announced its findings in its seasonal warming report, which showed average sea surface temperatures in the gulf hit 59.9 degrees, or more than 4 degrees above the long-term average.
“That’s the local manifestation of changes in the circulation patterns of the North Atlantic,” said GMRI research scientist Kathy Mills, who helped author the report.