Yes, it could be helpful to study tree rings, because they are giving us pieces of info about not only the past climate , but also the changes happened throughout ages. This kind of information is given by the carbon and oxygen isotopes found in tree rings.
It's important to take the study but to pay attention to the factors that are influencing the size of trees analyzed. For example, boreal forest has small size trees, but incredibly old. So a diameter of maximum 20cm could mean that the tree is about 400 years. But not only the location of the forest is an important growth factor, also the place occupied by the tree within the forest is important , too, because, in the same area, substances (water, nutrients) essential for growth and life of the tree, may vary.
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