http://weatherspark.com/averages/31697/St-Louis-Missouri-Uni...
Humidity was always the killer for me. I remember flying from San Diego to St. Louis. It was 75 degrees and dry in San Diego, and 102 degrees with 94% humidity in St. Louis. I wanted to die, heh
That said, I always liked the variety.
It means that I have pretty strong, nostalgic feelings associated with the seasons changing.