The featured chart presents the warmest high and coldest low each July for Ames with the bottom chart representing the range between those two values. The bottom panel is very interesting as it shows a long term trend of decreasing temperature range with this year falling in line with recent years below the long term average. One theory for this trend is that humidity levels have increased during July, which help to moderate swings in temperatures (difficult to get very hot during the day and very cold at night).

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Tags:   jul