The Institute's Climate Reanalyzer also has some visual data of historical daily sea surface temps that is referenced quite a bit these days.
Data only stretches back to the late 70s/early 80s, but many of the hottest trending years are within the last decade.
> Even though the dataset used for the unofficial record goes back only to 1979, Kapnick said that given other data, the world is likely seeing the hottest day in “several hundred years that we’ve experienced.”