This is Finals Week for Iowa State University and others in the state, so the feeling of summer is starting to set in. Some say the official start of summer is Memorial Day and others point to the summer solstice. For a data driven determination of the warmest 91 day period of the year, today's featured chart provides an answer. The chart plots the start day each year of the warmest 91 day stretch for a statewide areal averaged temperature for Iowa. The given summer's average temperature departure from a long term average is provided by the dot's color. A simple linear long term trend line is fit to the data as well. There is certainly a lot of spread for this date with a range from mid May to the end of June. The simple average is 8 June, so there is still time to enjoy the spring season.

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