weatherspark.com has a page of averages for cities. For example, near St Louis.

The highs and lows chart shows the 25th to 75th percentile in darker red and blue, 10th to 90th percentile in light color, and the averages with a dark line.



The time spent in the different temperature bands is useful, too. This includes all 24 hour periods in that time of year.


And they have wind speeds, wind directions, rain and thunderstorm percentages, and more.

I've started looking at their dew point chart to see if the hot weather is going to be muggy and uncomfortable, or drier and cooling.