What is the purpose of calculating the average annual air temperature?

In fact, scientists are pursuing several goals at once. You need to know where the temperature is, from this you can draw conclusions about a particular climatic zone. You can also determine how the climate and temperature changes from the poles to the equator. But the main goal is to know the dynamics of changes in the temperature of the planet, because if the average temperature rises, this means that climatic changes may occur on the planet or part of it. This is very important for many industries and for life in general.