You have touched on a pet peeve of mine. This such and such number on record is really meaningless. A somewhat accurate thermometer was not invented till 1714. I wonder when it’s use became widespread beyond just Europe,the East coast of North America and a handful of other places around the world. A few sailing ships would have carried them but the size of the oceans make that record suspect. I think you have to at least get to WW2 before you would have had something close to enough coverage for measurements to be truly global. Even then we don’t really have good worldwide records until satellites in space in the 1960’s. We really have just barely over 50 years of good enough temperature records globally to be accurate or truly useful. That is way to short for any kind of global climate trend or measurement.
Moreover, a recent study of the depths of the Pacific Ocean has revealed that while the surface temperatures are warm, the depths are still cooling as a result of the last atmospheric cooling that occurred during The Little Ice Age. This is due to the lagging effect that atmospheric temperature has on the Earth’s oceans. Any real atmospheric “warming” will not have a substantial impact on the greater bulk of our oceans until some point millennium distant into Earth’s future.
More pointedly, before that event ever occurs, we are set to enter another Grand Solar Minimum, where the Sun’s radiation output will substantially diminish to an extent that will bring Earth into a much colder climate, similar to the Maunder Minimum. This event is most likely timed to begin in earnest about the year 2030. At that time, we will wish to God there were such a thing as Anthropogenic “warming” - because millions of people, being unprepared, will perish for lack of food when massive crop failures become the norm across the entirety of Earth’s present temperate latitudes.