There is a trend, which is causing the major rivers in the United States to have hotter temperatures. When snow pack steadily declines as it has for about a decade and a half there is less water, when means it heats up faster because there is no cool water on the bottom as the depth is lessened. Additionally the water is coming from rain, not melting ice, which of course would be by definition just above freezing as it melts and floats into the rivers.

Many of the United States