Yes. One can tell a lot about the climate just by looking at tree rings. In tree rings, one year is shown by a dark layer followed by a light layer. The light layer shows how productive the spring and summer time is, whereas the dark layer represents the winter months, where the tree protects itself from the cold. In a colder climate where spring and summer are shorter, light rings in a tree tend to be smaller than in a tree that lives in a temperate area that has distinct seasons. One can also tell if there was a long harsh winter by a larger than usual dark ring. More information about dendrochronology, which is the studying of tree rings, can be found at the site below.
Usually. Many trees in extremely cold areas are not able to grow much.
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