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This indicates a cold and dry year. In areas where the length of the growing season is the limiting factor the thickness of tree rings can indicate when growing seasons were longer during warmer times and when growing seasons were shorter cooler times. Analyzing Tree Rings To Determine Climate Change Ppt Download RING POROUS WOOD The ring boundary of ring porous woods such as the oaks is readily discern able as the break between small thick-walled cells formed at the end of a growth season and very large open vessels or pores formed at the beginning of. . If there is a thicker ring in the inside of the tree it could indicate a longer season occured during the trees lifespan. A thin ring usually indicates a rough period of development such as lack of water forest fires or insect infestation. If the rings are wider it means warmer temperature and more availability of water. What was the average thickness of the annual rings ...