The data appear to be a screenshot of this website: https://climatereanalyzer.org/clim/sst_daily/ https://climatereanalyzer.org/clim/sst_daily/ Raspberries to

The data appear to be a screenshot of this website: https://climatereanalyzer.org/clim/sst_daily/ https://climatereanalyzer.org/clim/sst_daily/ Raspberries to the Tweeters for not properly citing sources. The two grey lines you're talking about are 2016 and 2020. One of those years had the worst California fire season ever recorded. 2016 was not quite record-smashing but did have the worst blizzard in the northeast US since 1978.