Very warm daytime high temperatures have returned to Iowa over the weekend with the only saving grace being much less humidity than the heat wave two weeks ago. Waterloo reached 100 degrees on Sunday and that is a somewhat rare feat for September. The featured chart shows the warmest daily high temperature for each September for Waterloo. Yesterday's 100 degrees was the first such reading since 7 September 1939! The yearly bar color indicates if the value is above or below the long term simple average. It is interesting to see 12 of the past 13 years with all above average max daily high temperature. The 30 year trailing average has certainly increased over this period as a result. The ongoing drought this year certainly contributed to the very warm temperatures we are now experiencing as drier vegetation and soil heats more efficiently than wetter.

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