The signs of fall are all around us this week with school starting up, football just around the corner, and some fall like temperatures this week. The actual start of the fall season is subjective to most folks, but if one considers the end of the warmest consecutive 91 day period as the summer season, then perhaps is already here, for at least Ames! The featured chart presents trailing 91 day average temperatures with the maximum and minimum values each year labelled. The plot indicates that Monday was the end of such a period with the temperatures on Tuesday pulling down the average enough to drop the value just slightly below. We are playing a bit of an arithmetic game here, so we need to look back 91 days ago to see what temperatures our current temperatures are replacing with the window average. So for around the 22nd of May, we find daily temperatures just slightly warmer and not much in the way of warmer temperatures to end May. Rewording, it would seem with hotter temperatures forecast next week, our 91 day average will again be on the upswing and we would not longer have a terminus to such a period (so summer continues). The middle panel of the featured plot would indicates that climatology says an end of summer at this time of August is a bit rare with about two more weeks to go before an average date is reached.

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