If the people in the Netherlands can do it - where it's flat, windy, and rainy most of the time - then most people in the US can also do it. If it's too hot, go in the mornings.
Because that is what the majority of Americans deal with. Not to mention a significant majority deal with colder and or hotter and more humid weather. Obviously, it can be done, but the Netherlands is not the standard for low quality bicycling environments.