Clearly localized. Where is the “global” part?
Not really localized (there are maxima and minima until equilibrium is achieved, and there is a night/day cycle), when you realize that the temperature differences are constantly being redistributed around the world. It is also clear that the land mass warms up faster than the immense body of water, and that water, therefore, has a dampening effect on coastal temperatures.
Since most of the landmass is located in the northern hemisphere, this will contribute more to raising the world average, and the southern hemisphere lowers the world average. The global average is increasing, less fast in the southern hemisphere, faster in the northern hemisphere.
Part of the redistribution of heat is done by the air, and part by the ocean currents. For example, in my part of the European continent, by the warm North Atlantic Gulf Stream going from the equator to the northeast in the direction of the Arctic Circle (which also causes more moderate European temperatures in winter). But the multi-decadal trend is almost 2°C higher in my country, over a period of only about 70 years. The extremes are becoming more extreme.
Cheers,
Bart