The featured chart displays the high and low temperature distributions for 2 June from long term reporting sites in Iowa. The actual reports on Tuesday were about in the middle of the long term distributions. It is interesting to compare the shapes of the two curves. The low temperature distribution is narrower due to the different processes that govern the daily low temperature versus the high. The low temperature is typically a function of overnight clouds, soil temperatures, and humidity levels, while the high temperature is related to amount of sunshine and air mass transport.

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