Terrestrial and freshwater hotspots have been warming less over the last 50 years than non-hotspot areas, whereas marine hotspots have been warming more . The warming inside terrestrial hotspots is 0.91℃  and 1.04℃ , respectively, while for freshwater hotspots it is 0.89ºC, compared to 1.08℃ warming outside . In contrast, mean annual sea surface temperatures in the G200 marine biodiversity hotspots have warmed 41% more than the regions outside  . Thus, terrestrial biodiversity hotspots have been warming slightly less, and marine hotspots considerably more than non-hotspots .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report