While it depends on your calendar date definition of if we are still in summer or not, the weather on Tuesday was undoubtedly summer-like with temperatures in the 90s and dew point readings in the upper 60s to near 70 degrees. A few locations in northwestern Iowa were even able to eek out a triple digit air temperature with the Spencer Airport hitting 101. Hitting 100 degrees in September is a rare feat and given this happened on September 20th makes it even more exceptional. The featured chart presents the latest into the year that a given high temperature threshold was at least observed. Just to note that a high temperature of 101 would count for that level and all levels below it within this chart accounting. So you can see that yesterday's observation was the latest date for a threshold of 98 degrees through 101.

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