The Delaware River winds through the Upper Delaware in a valley of swiftly changing scenery, with rapids and quiet pools, rolling hills, and riverfront villages. It is one of the finest fishing rivers in the northeastern United States, and its clean water, as the last major undammed river in the eastern United States, supports a healthy ecosystem while offering both tranquility and excitement. Spring temperatures usually range from lows of 26 F to highs of 80 F with average rainfall of 5 inches. Summer temperatures usually range from lows of 55 F to highs of 85 F with average rainfall of 4 inches. Fall temperatures usually range from lows of 30 F to highs of 83 F, and fall foliage reaches its peak sometime in October as daily mountain temperatures vary frequently and influence the change. Winter temperatures usually range from lows of 15 F to highs of 49 F.