Yep, people don't tend to come and go at those type of events on blazing hot days.
Just an FYI to all reading this board. ku listed somewhere in the neighborhood of 30-35 games straight, in the late 1980's as having attendance figures that ended in 00 or 000. They had similar stretches throughtout the 1990's and into the 00's.
In fact, the guy doing the counting in the late 1980's went on to develop the "Acura" trademark.