when do you switch your winter clothes for your summer clothes and vice-versa?

Soon as it gets warm. Winter clothes around November.

I live in the Midwest and have a walk in closet. I dress weather appropriate there's no switching in and out. Granted by June I no longer need long sleeves and around October the short sleeve days are limited

I don't put any clothes away as I have a large walk-in closet. I wear a lot of three quarter length sleeves of cotton/lyrica which can be worn year round.

Some clothes get put away. Like sweaters and such are put up.
Then in the winter the sweaters are out and the shorts/short sleeve shirts are put up.

We have very hot summers.

I have two different closets. I should get things organized better, so that one is for summer clothes and one is for winter clothes. Let's see if I can get it done one of these days...

I switch as soon as the first warm days arrive - unfortunately my closet is so tiny it doesn't really make much of a difference in which corner I store my sweaters...

Yeah, you have to adapt yourself after the weather. But I usually wear summer clothes from May to September and winter clothes from October to April.