Yes, and the study of these tree rings is called dendrochronology. One year in tree rings is represented by a dark ring and a light ring; the dark ring represents the winter months, and the light ring represents the spring/summer months. The way they can study the climate is by the width of the rings compared to each other, and other trees in the area. If there is a small light ring, then it usually means that there was a short spring; a larger than usual dark ring, denotes a harsh winter. During the little ice age this can be seen in many tree ring records.
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